21620474535166 has 16 divisors (see below), whose sum is σ = 35346169679184. Its totient is φ = 9858455486784.

The previous prime is 21620474535161. The next prime is 21620474535269. The reversal of 21620474535166 is 66153547402612.

It is a super-2 number, since 2×21620474535166² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21620474535161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5009375631 + ... + 5009379946.

It is an arithmetic number, because the mean of its divisors is an integer number (2209135604949).

Almost surely, 2^{21620474535166} is an apocalyptic number.

21620474535166 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21620474535166 is a deficient number, since it is larger than the sum of its proper divisors (13725695144018).

21620474535166 is a wasteful number, since it uses less digits than its factorization.

21620474535166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10018755675.

The product of its (nonzero) digits is 7257600, while the sum is 52.

The spelling of 21620474535166 in words is "twenty-one trillion, six hundred twenty billion, four hundred seventy-four million, five hundred thirty-five thousand, one hundred sixty-six".