21422164556631 has 16 divisors (see below), whose sum is σ = 29550312092160. Its totient is φ = 13787813326560.

The previous prime is 21422164556599. The next prime is 21422164556647. The reversal of 21422164556631 is 13665546122412.

It is not a de Polignac number, because 21422164556631 - 2⁵ = 21422164556599 is a prime.

It is a super-2 number, since 2×21422164556631² (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 (21422164556531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9376915 + ... + 11435508.

It is an arithmetic number, because the mean of its divisors is an integer number (1846894505760).

Almost surely, 2^{21422164556631} is an apocalyptic number.

21422164556631 is a deficient number, since it is larger than the sum of its proper divisors (8128147535529).

21422164556631 is a wasteful number, since it uses less digits than its factorization.

21422164556631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20824286.

The product of its digits is 2073600, while the sum is 48.

The spelling of 21422164556631 in words is "twenty-one trillion, four hundred twenty-two billion, one hundred sixty-four million, five hundred fifty-six thousand, six hundred thirty-one".