21613291075 has 6 divisors (see below), whose sum is σ = 26800480964. Its totient is φ = 17290632840.

The previous prime is 21613291009. The next prime is 21613291123. The reversal of 21613291075 is 57019231612.

It is not a de Polignac number, because 21613291075 - 2⁹ = 21613290563 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 432265797 + ... + 432265846.

Almost surely, 2^21613291075 is an apocalyptic number.

21613291075 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21613291075 is a deficient number, since it is larger than the sum of its proper divisors (5187189889).

21613291075 is an equidigital number, since it uses as much as digits as its factorization.

21613291075 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 864531653 (or 864531648 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 37.

The spelling of 21613291075 in words is "twenty-one billion, six hundred thirteen million, two hundred ninety-one thousand, seventy-five".