21111110112 has 48 divisors (see below), whose sum is σ = 57204306432. Its totient is φ = 6810034560.

The previous prime is 21111110093. The next prime is 21111110123. The reversal of 21111110112 is 21101111112.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-3 number, since 3×21111110112³ (a number of 32 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3543918 + ... + 3549869.

It is an arithmetic number, because the mean of its divisors is an integer number (1191756384).

Almost surely, 2^21111110112 is an apocalyptic number.

It is an amenable number.

21111110112 is an abundant number, since it is smaller than the sum of its proper divisors (36093196320).

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

21111110112 is a wasteful number, since it uses less digits than its factorization.

21111110112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7093831 (or 7093823 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 21111110112 its reverse (21101111112), we get a palindrome (42212221224).

The spelling of 21111110112 in words is "twenty-one billion, one hundred eleven million, one hundred ten thousand, one hundred twelve".