21275266413 has 32 divisors (see below), whose sum is σ = 29405545344. Its totient is φ = 13675364352.

The previous prime is 21275266379. The next prime is 21275266553. The reversal of 21275266413 is 31466257212.

It is not a de Polignac number, because 21275266413 - 2⁸ = 21275266157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21275266013) 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 in 31 ways as a sum of consecutive naturals, for example, 2542845 + ... + 2551197.

It is an arithmetic number, because the mean of its divisors is an integer number (918923292).

Almost surely, 2^21275266413 is an apocalyptic number.

It is an amenable number.

21275266413 is a deficient number, since it is larger than the sum of its proper divisors (8130278931).

21275266413 is a wasteful number, since it uses less digits than its factorization.

21275266413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8685.

The product of its digits is 120960, while the sum is 39.

The spelling of 21275266413 in words is "twenty-one billion, two hundred seventy-five million, two hundred sixty-six thousand, four hundred thirteen".