21160634431 has 2 divisors, whose sum is σ = 21160634432. Its totient is φ = 21160634430.

The previous prime is 21160634413. The next prime is 21160634471. The reversal of 21160634431 is 13443606112.

It is a happy number.

Together with previous prime (21160634413) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21160634431 - 2⁵ = 21160634399 is a prime.

It is a super-2 number, since 2×21160634431² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21160634393 and 21160634402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21160634401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10580317215 + 10580317216.

It is an arithmetic number, because the mean of its divisors is an integer number (10580317216).

Almost surely, 2^21160634431 is an apocalyptic number.

21160634431 is a deficient number, since it is larger than the sum of its proper divisors (1).

21160634431 is an equidigital number, since it uses as much as digits as its factorization.

21160634431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 31.

The spelling of 21160634431 in words is "twenty-one billion, one hundred sixty million, six hundred thirty-four thousand, four hundred thirty-one".