211012200100021 has 4 divisors (see below), whose sum is σ = 211012248919500. Its totient is φ = 211012151280544.

The previous prime is 211012200100003. The next prime is 211012200100073. The reversal of 211012200100021 is 120001002210112.

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 55094248502500 + 155917951597521 = 7422550^2 + 12486711^2 .

It is a cyclic number.

It is not a de Polignac number, because 211012200100021 - 2⁷ = 211012200099893 is a prime.

It is a super-2 number, since 2×211012200100021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211012200099974 and 211012200100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211012200103021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17220496 + ... + 26806153.

It is an arithmetic number, because the mean of its divisors is an integer number (52753062229875).

Almost surely, 2^{211012200100021} is an apocalyptic number.

It is an amenable number.

211012200100021 is a deficient number, since it is larger than the sum of its proper divisors (48819479).

211012200100021 is an equidigital number, since it uses as much as digits as its factorization.

211012200100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48819478.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 211012200100021 its reverse (120001002210112), we get a palindrome (331013202310133).

The spelling of 211012200100021 in words is "two hundred eleven trillion, twelve billion, two hundred million, one hundred thousand, twenty-one".