21031323212100 has 72 divisors (see below), whose sum is σ = 60891387076800. Its totient is φ = 5604596305280.

The previous prime is 21031323212089. The next prime is 21031323212149. The reversal of 21031323212100 is 121232313012.

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, 23029800 + ... + 23925599.

It is an arithmetic number, because the mean of its divisors is an integer number (845713709400).

Almost surely, 2^{21031323212100} is an apocalyptic number.

21031323212100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21031323212100 is an abundant number, since it is smaller than the sum of its proper divisors (39860063864700).

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

21031323212100 is a wasteful number, since it uses less digits than its factorization.

21031323212100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46956909 (or 46956902 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21031323212100 its reverse (121232313012), we get a palindrome (21152555525112).

The spelling of 21031323212100 in words is "twenty-one trillion, thirty-one billion, three hundred twenty-three million, two hundred twelve thousand, one hundred".