21388422836 has 12 divisors (see below), whose sum is σ = 40832443680. Its totient is φ = 9722010360.

The previous prime is 21388422827. The next prime is 21388422877. The reversal of 21388422836 is 63822488312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 243050216 + ... + 243050303.

It is an arithmetic number, because the mean of its divisors is an integer number (3402703640).

Almost surely, 2^21388422836 is an apocalyptic number.

It is an amenable number.

21388422836 is a deficient number, since it is larger than the sum of its proper divisors (19444020844).

21388422836 is a wasteful number, since it uses less digits than its factorization.

21388422836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486100534 (or 486100532 counting only the distinct ones).

The product of its digits is 884736, while the sum is 47.

The spelling of 21388422836 in words is "twenty-one billion, three hundred eighty-eight million, four hundred twenty-two thousand, eight hundred thirty-six".