21601631200931 has 2 divisors, whose sum is σ = 21601631200932. Its totient is φ = 21601631200930.

The previous prime is 21601631200907. The next prime is 21601631200939. The reversal of 21601631200931 is 13900213610612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21601631200931 - 2²² = 21601627006627 is a prime.

It is a super-2 number, since 2×21601631200931² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21601631200891 and 21601631200900.

It is not a weakly prime, because it can be changed into another prime (21601631200939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10800815600465 + 10800815600466.

It is an arithmetic number, because the mean of its divisors is an integer number (10800815600466).

Almost surely, 2^{21601631200931} is an apocalyptic number.

21601631200931 is a deficient number, since it is larger than the sum of its proper divisors (1).

21601631200931 is an equidigital number, since it uses as much as digits as its factorization.

21601631200931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 35.

The spelling of 21601631200931 in words is "twenty-one trillion, six hundred one billion, six hundred thirty-one million, two hundred thousand, nine hundred thirty-one".