21130111112 has 32 divisors (see below), whose sum is σ = 43283354400. Its totient is φ = 9590668800.

The previous prime is 21130111091. The next prime is 21130111133. The reversal of 21130111112 is 21111103112.

It is an interprime number because it is at equal distance from previous prime (21130111091) and next prime (21130111133).

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, 112937 + ... + 234552.

It is an arithmetic number, because the mean of its divisors is an integer number (1352604825).

Almost surely, 2^21130111112 is an apocalyptic number.

21130111112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21130111112 is an abundant number, since it is smaller than the sum of its proper divisors (22153243288).

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

21130111112 is a wasteful number, since it uses less digits than its factorization.

21130111112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348197 (or 348193 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 14.

Adding to 21130111112 its reverse (21111103112), we get a palindrome (42241214224).

The spelling of 21130111112 in words is "twenty-one billion, one hundred thirty million, one hundred eleven thousand, one hundred twelve".