21160634457 has 16 divisors (see below), whose sum is σ = 29702272320. Its totient is φ = 13363200000.

The previous prime is 21160634431. The next prime is 21160634471. The reversal of 21160634457 is 75443606112.

It is a happy number.

It is not a de Polignac number, because 21160634457 - 2⁷ = 21160634329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21160634357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 900457 + ... + 923657.

It is an arithmetic number, because the mean of its divisors is an integer number (1856392020).

Almost surely, 2^21160634457 is an apocalyptic number.

It is an amenable number.

21160634457 is a deficient number, since it is larger than the sum of its proper divisors (8541637863).

21160634457 is a wasteful number, since it uses less digits than its factorization.

21160634457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39224.

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

The spelling of 21160634457 in words is "twenty-one billion, one hundred sixty million, six hundred thirty-four thousand, four hundred fifty-seven".