21012111202100 has 72 divisors (see below), whose sum is σ = 48310844704920. Its totient is φ = 7905128325120.

The previous prime is 21012111202067. The next prime is 21012111202123. The reversal of 21012111202100 is 120211121012.

It can be written as a sum of positive squares in 12 ways, for example, as 2173837667236 + 18838273534864 = 1474394^2 + 4340308^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1619159 + ... + 6681758.

It is an arithmetic number, because the mean of its divisors is an integer number (670983954235).

Almost surely, 2^{21012111202100} is an apocalyptic number.

21012111202100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012111202100 is an abundant number, since it is smaller than the sum of its proper divisors (27298733502820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21012111202100 is a wasteful number, since it uses less digits than its factorization.

21012111202100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8302437 (or 8302430 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21012111202100 its reverse (120211121012), we get a palindrome (21132322323112).

The spelling of 21012111202100 in words is "twenty-one trillion, twelve billion, one hundred eleven million, two hundred two thousand, one hundred".