21012331100100 has 72 divisors (see below), whose sum is σ = 60970881967968. Its totient is φ = 5587140460800.

The previous prime is 21012331100023. The next prime is 21012331100113. The reversal of 21012331100100 is 100113321012.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21012331100100.

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, 100819681 + ... + 101027880.

Almost surely, 2^{21012331100100} is an apocalyptic number.

21012331100100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012331100100 is an abundant number, since it is smaller than the sum of its proper divisors (39958550867868).

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

21012331100100 is a wasteful number, since it uses less digits than its factorization.

21012331100100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201847925 (or 201847918 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21012331100100 its reverse (100113321012), we get a palindrome (21112444421112).

The spelling of 21012331100100 in words is "twenty-one trillion, twelve billion, three hundred thirty-one million, one hundred thousand, one hundred".