21867166623 has 32 divisors (see below), whose sum is σ = 31112916480. Its totient is φ = 13613414400.

The previous prime is 21867166577. The next prime is 21867166627. The reversal of 21867166623 is 32666176812.

It is not a de Polignac number, because 21867166623 - 2²⁰ = 21866118047 is a prime.

It is a super-2 number, since 2×21867166623² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21867166627) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11465836 + ... + 11467742.

It is an arithmetic number, because the mean of its divisors is an integer number (972278640).

Almost surely, 2^21867166623 is an apocalyptic number.

21867166623 is a deficient number, since it is larger than the sum of its proper divisors (9245749857).

21867166623 is a wasteful number, since it uses less digits than its factorization.

21867166623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3567.

The product of its digits is 870912, while the sum is 48.

The spelling of 21867166623 in words is "twenty-one billion, eight hundred sixty-seven million, one hundred sixty-six thousand, six hundred twenty-three".