21236152631 has 2 divisors, whose sum is σ = 21236152632. Its totient is φ = 21236152630.

The previous prime is 21236152601. The next prime is 21236152643. The reversal of 21236152631 is 13625163212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21236152631 - 2²⁶ = 21169043767 is a prime.

It is a super-2 number, since 2×21236152631² (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 (21236152601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10618076315 + 10618076316.

It is an arithmetic number, because the mean of its divisors is an integer number (10618076316).

Almost surely, 2^21236152631 is an apocalyptic number.

21236152631 is a deficient number, since it is larger than the sum of its proper divisors (1).

21236152631 is an equidigital number, since it uses as much as digits as its factorization.

21236152631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 32.

The spelling of 21236152631 in words is "twenty-one billion, two hundred thirty-six million, one hundred fifty-two thousand, six hundred thirty-one".