21111211100112 has 80 divisors (see below), whose sum is σ = 64012887234432. Its totient is φ = 5868753661440.

The previous prime is 21111211100101. The next prime is 21111211100113. The reversal of 21111211100112 is 21100111211112.

It is a super-2 number, since 2×21111211100112² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21111211100091 and 21111211100100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111211100113) 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, 849054939 + ... + 849079802.

Almost surely, 2^{21111211100112} is an apocalyptic number.

It is an amenable number.

21111211100112 is an abundant number, since it is smaller than the sum of its proper divisors (42901676134320).

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

21111211100112 is a wasteful number, since it uses less digits than its factorization.

21111211100112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1698134796 (or 1698134790 counting only the distinct ones).

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

Adding to 21111211100112 its reverse (21100111211112), we get a palindrome (42211322311224).

The spelling of 21111211100112 in words is "twenty-one trillion, one hundred eleven billion, two hundred eleven million, one hundred thousand, one hundred twelve".