21368797392 has 20 divisors (see below), whose sum is σ = 55202726720. Its totient is φ = 7122932448.

The previous prime is 21368797379. The next prime is 21368797399. The reversal of 21368797392 is 29379786312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21368797399) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 222591592 + ... + 222591687.

It is an arithmetic number, because the mean of its divisors is an integer number (2760136336).

Almost surely, 2^21368797392 is an apocalyptic number.

It is an amenable number.

21368797392 is an abundant number, since it is smaller than the sum of its proper divisors (33833929328).

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

21368797392 is a wasteful number, since it uses less digits than its factorization.

21368797392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445183290 (or 445183284 counting only the distinct ones).

The product of its digits is 6858432, while the sum is 57.

The spelling of 21368797392 in words is "twenty-one billion, three hundred sixty-eight million, seven hundred ninety-seven thousand, three hundred ninety-two".