21507463970231 has 2 divisors, whose sum is σ = 21507463970232. Its totient is φ = 21507463970230.

The previous prime is 21507463970219. The next prime is 21507463970339. The reversal of 21507463970231 is 13207936470512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21507463970231 - 2²² = 21507459775927 is a prime.

It is a super-2 number, since 2×21507463970231² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21507463970231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21507463960231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10753731985115 + 10753731985116.

It is an arithmetic number, because the mean of its divisors is an integer number (10753731985116).

Almost surely, 2^{21507463970231} is an apocalyptic number.

21507463970231 is a deficient number, since it is larger than the sum of its proper divisors (1).

21507463970231 is an equidigital number, since it uses as much as digits as its factorization.

21507463970231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1905120, while the sum is 50.

The spelling of 21507463970231 in words is "twenty-one trillion, five hundred seven billion, four hundred sixty-three million, nine hundred seventy thousand, two hundred thirty-one".