21817003612 has 24 divisors (see below), whose sum is σ = 40194514640. Its totient is φ = 10333008000.

The previous prime is 21817003603. The next prime is 21817003627. The reversal of 21817003612 is 21630071812.

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, 784408 + ... + 811744.

Almost surely, 2^21817003612 is an apocalyptic number.

It is an amenable number.

21817003612 is a deficient number, since it is larger than the sum of its proper divisors (18377511028).

21817003612 is a wasteful number, since it uses less digits than its factorization.

21817003612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37861 (or 37859 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The spelling of 21817003612 in words is "twenty-one billion, eight hundred seventeen million, three thousand, six hundred twelve".