21000553112 has 32 divisors (see below), whose sum is σ = 49092203520. Its totient is φ = 8182033440.

The previous prime is 21000553109. The next prime is 21000553157. The reversal of 21000553112 is 21135500012.

It is a happy number.

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, 17045288 + ... + 17046519.

It is an arithmetic number, because the mean of its divisors is an integer number (1534131360).

Almost surely, 2^21000553112 is an apocalyptic number.

21000553112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21000553112 is an abundant number, since it is smaller than the sum of its proper divisors (28091650408).

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

21000553112 is a wasteful number, since it uses less digits than its factorization.

21000553112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34091831 (or 34091827 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 20.

The spelling of 21000553112 in words is "twenty-one billion, five hundred fifty-three thousand, one hundred twelve".