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211031212031 = 521405050311
BaseRepresentation
bin1100010010001001110…
…0001011111111111111
3202011201010110022120222
43010202130023333333
511424142442241111
6240540231131555
721150356464013
oct3044234137777
9664633408528
10211031212031
1181552688062
1234a95b13bbb
1316b91854383
14a2dd198543
155751b2b7db
hex312270bfff

211031212031 has 4 divisors (see below), whose sum is σ = 211436262864. Its totient is φ = 210626161200.

The previous prime is 211031211983. The next prime is 211031212039. The reversal of 211031212031 is 130212130112.

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

It is a cyclic number.

It is not a de Polignac number, because 211031212031 - 234 = 193851342847 is a prime.

It is a super-2 number, since 2×2110312120312 (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211031212039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202524635 + ... + 202525676.

It is an arithmetic number, because the mean of its divisors is an integer number (52859065716).

Almost surely, 2211031212031 is an apocalyptic number.

211031212031 is a deficient number, since it is larger than the sum of its proper divisors (405050833).

211031212031 is an equidigital number, since it uses as much as digits as its factorization.

211031212031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405050832.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 211031212031 its reverse (130212130112), we get a palindrome (341243342143).

The spelling of 211031212031 in words is "two hundred eleven billion, thirty-one million, two hundred twelve thousand, thirty-one".

Divisors: 1 521 405050311 211031212031