21089245317 has 32 divisors (see below), whose sum is σ = 33540998400. Its totient is φ = 11535214080.

The previous prime is 21089245259. The next prime is 21089245343. The reversal of 21089245317 is 71354298012.

It is not a de Polignac number, because 21089245317 - 2⁶ = 21089245253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21089245217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 185442 + ... + 276707.

It is an arithmetic number, because the mean of its divisors is an integer number (1048156200).

Almost surely, 2^21089245317 is an apocalyptic number.

It is an amenable number.

21089245317 is a deficient number, since it is larger than the sum of its proper divisors (12451753083).

21089245317 is a wasteful number, since it uses less digits than its factorization.

21089245317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462253.

The product of its (nonzero) digits is 120960, while the sum is 42.

The spelling of 21089245317 in words is "twenty-one billion, eighty-nine million, two hundred forty-five thousand, three hundred seventeen".