21021110111112 has 128 divisors (see below), whose sum is σ = 53262113034240. Its totient is φ = 6913109790720.

The previous prime is 21021110111101. The next prime is 21021110111137. The reversal of 21021110111112 is 21111101112012.

It is a junction number, because it is equal to n+sod(n) for n = 21021110111091 and 21021110111100.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1379239812 + ... + 1379255052.

It is an arithmetic number, because the mean of its divisors is an integer number (416110258080).

Almost surely, 2^{21021110111112} is an apocalyptic number.

It is an amenable number.

21021110111112 is an abundant number, since it is smaller than the sum of its proper divisors (32241002923128).

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

21021110111112 is a wasteful number, since it uses less digits than its factorization.

21021110111112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17871 (or 17867 counting only the distinct ones).

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

Adding to 21021110111112 its reverse (21111101112012), we get a palindrome (42132211223124).

The spelling of 21021110111112 in words is "twenty-one trillion, twenty-one billion, one hundred ten million, one hundred eleven thousand, one hundred twelve".