21111102020112 has 80 divisors (see below), whose sum is σ = 59559382205568. Its totient is φ = 6404234618880.

The previous prime is 21111102020111. The next prime is 21111102020137. The reversal of 21111102020112 is 21102020111112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21111102020091 and 21111102020100.

It is not an unprimeable number, because it can be changed into a prime (21111102020111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 238208473 + ... + 238297080.

Almost surely, 2^{21111102020112} is an apocalyptic number.

It is an amenable number.

21111102020112 is an abundant number, since it is smaller than the sum of its proper divisors (38448280185456).

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

21111102020112 is a wasteful number, since it uses less digits than its factorization.

21111102020112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476505648 (or 476505642 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21111102020112 its reverse (21102020111112), we get a palindrome (42213122131224).

The spelling of 21111102020112 in words is "twenty-one trillion, one hundred eleven billion, one hundred two million, twenty thousand, one hundred twelve".