21437079788 has 12 divisors (see below), whose sum is σ = 37731739920. Its totient is φ = 10656582672.

The previous prime is 21437079761. The next prime is 21437079799. The reversal of 21437079788 is 88797073412.

It is a happy number.

It is a hoax number, since the sum of its digits (56) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15488528 + ... + 15489911.

It is an arithmetic number, because the mean of its divisors is an integer number (3144311660).

Almost surely, 2^21437079788 is an apocalyptic number.

It is an amenable number.

21437079788 is a deficient number, since it is larger than the sum of its proper divisors (16294660132).

21437079788 is a wasteful number, since it uses less digits than its factorization.

21437079788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30978616 (or 30978614 counting only the distinct ones).

The product of its (nonzero) digits is 4741632, while the sum is 56.

The spelling of 21437079788 in words is "twenty-one billion, four hundred thirty-seven million, seventy-nine thousand, seven hundred eighty-eight".