21000010112 has 64 divisors (see below), whose sum is σ = 42090993600. Its totient is φ = 10436235264.

The previous prime is 21000010103. The next prime is 21000010133. The reversal of 21000010112 is 21101000012.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a self number, because there is not a number n which added to its sum of digits gives 21000010112.

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, 19212638 + ... + 19213730.

It is an arithmetic number, because the mean of its divisors is an integer number (657671775).

Almost surely, 2^21000010112 is an apocalyptic number.

It is an amenable number.

21000010112 is an abundant number, since it is smaller than the sum of its proper divisors (21090983488).

21000010112 is a wasteful number, since it uses less digits than its factorization.

21000010112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1883 (or 1871 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21000010112 its reverse (21101000012), we get a palindrome (42101010124).

The spelling of 21000010112 in words is "twenty-one billion, ten thousand, one hundred twelve".