21159627631 has 2 divisors, whose sum is σ = 21159627632. Its totient is φ = 21159627630.

The previous prime is 21159627581. The next prime is 21159627641. The reversal of 21159627631 is 13672695112.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21159627631 is a prime.

It is a super-2 number, since 2×21159627631² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21159627641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10579813815 + 10579813816.

It is an arithmetic number, because the mean of its divisors is an integer number (10579813816).

Almost surely, 2^21159627631 is an apocalyptic number.

21159627631 is a deficient number, since it is larger than the sum of its proper divisors (1).

21159627631 is an equidigital number, since it uses as much as digits as its factorization.

21159627631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 136080, while the sum is 43.

The spelling of 21159627631 in words is "twenty-one billion, one hundred fifty-nine million, six hundred twenty-seven thousand, six hundred thirty-one".