21312550012 has 48 divisors (see below), whose sum is σ = 40397480032. Its totient is φ = 9780030720.

The previous prime is 21312549989. The next prime is 21312550073. The reversal of 21312550012 is 21005521312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7960018 + ... + 7962694.

Almost surely, 2^21312550012 is an apocalyptic number.

It is an amenable number.

21312550012 is a deficient number, since it is larger than the sum of its proper divisors (19084930020).

21312550012 is a wasteful number, since it uses less digits than its factorization.

21312550012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3518 (or 3516 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The spelling of 21312550012 in words is "twenty-one billion, three hundred twelve million, five hundred fifty thousand, twelve".