21620473722466 has 16 divisors (see below), whose sum is σ = 32452195593888. Its totient is φ = 10803077084800.

The previous prime is 21620473722391. The next prime is 21620473722481. The reversal of 21620473722466 is 66422737402612.

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, 22550421 + ... + 23489623.

It is an arithmetic number, because the mean of its divisors is an integer number (2028262224618).

Almost surely, 2^{21620473722466} is an apocalyptic number.

21620473722466 is a deficient number, since it is larger than the sum of its proper divisors (10831721871422).

21620473722466 is a wasteful number, since it uses less digits than its factorization.

21620473722466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946817.

The product of its (nonzero) digits is 8128512, while the sum is 52.

The spelling of 21620473722466 in words is "twenty-one trillion, six hundred twenty billion, four hundred seventy-three million, seven hundred twenty-two thousand, four hundred sixty-six".