221636585636131 has 2 divisors, whose sum is σ = 221636585636132. Its totient is φ = 221636585636130.

The previous prime is 221636585636111. The next prime is 221636585636149. The reversal of 221636585636131 is 131636585636122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221636585636131 - 2⁷ = 221636585636003 is a prime.

It is a super-2 number, since 2×221636585636131² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (221636585636111) 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, 110818292818065 + 110818292818066.

It is an arithmetic number, because the mean of its divisors is an integer number (110818292818066).

Almost surely, 2^{221636585636131} is an apocalyptic number.

221636585636131 is a deficient number, since it is larger than the sum of its proper divisors (1).

221636585636131 is an equidigital number, since it uses as much as digits as its factorization.

221636585636131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27993600, while the sum is 58.

Subtracting from 221636585636131 its reverse (131636585636122), we obtain a palindrome (90000000000009).

The spelling of 221636585636131 in words is "two hundred twenty-one trillion, six hundred thirty-six billion, five hundred eighty-five million, six hundred thirty-six thousand, one hundred thirty-one".