21012111101112 has 16 divisors (see below), whose sum is σ = 52530277752840. Its totient is φ = 7004037033696.

The previous prime is 21012111101039. The next prime is 21012111101129. The reversal of 21012111101112 is 21110111121012.

It is a junction number, because it is equal to n+sod(n) for n = 21012111101091 and 21012111101100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 437752314583 + ... + 437752314630.

Almost surely, 2^{21012111101112} is an apocalyptic number.

It is an amenable number.

21012111101112 is an abundant number, since it is smaller than the sum of its proper divisors (31518166651728).

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

21012111101112 is a wasteful number, since it uses less digits than its factorization.

21012111101112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875504629222 (or 875504629218 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21012111101112 its reverse (21110111121012), we get a palindrome (42122222222124).

The spelling of 21012111101112 in words is "twenty-one trillion, twelve billion, one hundred eleven million, one hundred one thousand, one hundred twelve".