21012112002100 has 72 divisors (see below), whose sum is σ = 45823043762496. Its totient is φ = 8363140320000.

The previous prime is 21012112002071. The next prime is 21012112002163. The reversal of 21012112002100 is 120021121012.

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, 17166480 + ... + 18349720.

It is an arithmetic number, because the mean of its divisors is an integer number (636431163368).

Almost surely, 2^{21012112002100} is an apocalyptic number.

21012112002100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21012112002100 is an abundant number, since it is smaller than the sum of its proper divisors (24810931760396).

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

21012112002100 is a wasteful number, since it uses less digits than its factorization.

21012112002100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184137 (or 1184130 counting only the distinct ones).

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

Adding to 21012112002100 its reverse (120021121012), we get a palindrome (21132133123112).

The spelling of 21012112002100 in words is "twenty-one trillion, twelve billion, one hundred twelve million, two thousand, one hundred".