21601631177464 has 16 divisors (see below), whose sum is σ = 43618678339320. Its totient is φ = 9969983620320.

The previous prime is 21601631177417. The next prime is 21601631177491. The reversal of 21601631177464 is 46477113610612.

It is a super-2 number, since 2×21601631177464² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103853995942 + ... + 103853996149.

Almost surely, 2^{21601631177464} is an apocalyptic number.

It is an amenable number.

21601631177464 is an abundant number, since it is smaller than the sum of its proper divisors (22017047161856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21601631177464 is a wasteful number, since it uses less digits than its factorization.

21601631177464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207707992110 (or 207707992106 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 49.

The spelling of 21601631177464 in words is "twenty-one trillion, six hundred one billion, six hundred thirty-one million, one hundred seventy-seven thousand, four hundred sixty-four".