21469608971 has 2 divisors, whose sum is σ = 21469608972. Its totient is φ = 21469608970.

The previous prime is 21469608931. The next prime is 21469608997. The reversal of 21469608971 is 17980696412.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21469608971 is a prime.

It is not a weakly prime, because it can be changed into another prime (21469608931) 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, 10734804485 + 10734804486.

It is an arithmetic number, because the mean of its divisors is an integer number (10734804486).

Almost surely, 2^21469608971 is an apocalyptic number.

21469608971 is a deficient number, since it is larger than the sum of its proper divisors (1).

21469608971 is an equidigital number, since it uses as much as digits as its factorization.

21469608971 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 53.

The spelling of 21469608971 in words is "twenty-one billion, four hundred sixty-nine million, six hundred eight thousand, nine hundred seventy-one".