21407233223978 has 32 divisors (see below), whose sum is σ = 36716666152320. Its totient is φ = 9169891211520.

The previous prime is 21407233223939. The next prime is 21407233223989. The reversal of 21407233223978 is 87932233270412.

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, 535040438 + ... + 535080446.

It is an arithmetic number, because the mean of its divisors is an integer number (1147395817260).

Almost surely, 2^{21407233223978} is an apocalyptic number.

21407233223978 is a deficient number, since it is larger than the sum of its proper divisors (15309432928342).

21407233223978 is a wasteful number, since it uses less digits than its factorization.

21407233223978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58382.

The product of its (nonzero) digits is 6096384, while the sum is 53.

The spelling of 21407233223978 in words is "twenty-one trillion, four hundred seven billion, two hundred thirty-three million, two hundred twenty-three thousand, nine hundred seventy-eight".