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211012100021 = 1131867363717
BaseRepresentation
bin1100010010000101001…
…1010001111110110101
3202011122210111022211202
43010201103101332311
511424123044200041
6240534305342245
721150035153612
oct3044123217665
9664583438752
10211012100021
1181542913a08
1234a8b637985
1316b8a8c21a8
14a2da821509
155750103a9b
hex31214d1fb5

211012100021 has 4 divisors (see below), whose sum is σ = 212879463852. Its totient is φ = 209144736192.

The previous prime is 211012100017. The next prime is 211012100027. The reversal of 211012100021 is 120001210112.

211012100021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 99044901796 + 111967198225 = 314714^2 + 334615^2 .

It is a cyclic number.

It is not a de Polignac number, because 211012100021 - 22 = 211012100017 is a prime.

It is a super-3 number, since 3×2110121000213 (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211012099975 and 211012100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211012100027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 933681746 + ... + 933681971.

It is an arithmetic number, because the mean of its divisors is an integer number (53219865963).

Almost surely, 2211012100021 is an apocalyptic number.

It is an amenable number.

211012100021 is a deficient number, since it is larger than the sum of its proper divisors (1867363831).

211012100021 is a wasteful number, since it uses less digits than its factorization.

211012100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1867363830.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 211012100021 its reverse (120001210112), we get a palindrome (331013310133).

The spelling of 211012100021 in words is "two hundred eleven billion, twelve million, one hundred thousand, twenty-one".

Divisors: 1 113 1867363717 211012100021