21064931315 has 8 divisors (see below), whose sum is σ = 25278752688. Its totient is φ = 16851388320.

The previous prime is 21064931291. The next prime is 21064931369. The reversal of 21064931315 is 51313946012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21064931315 - 2⁸ = 21064931059 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 175109 + ... + 269801.

It is an arithmetic number, because the mean of its divisors is an integer number (3159844086).

Almost surely, 2^21064931315 is an apocalyptic number.

21064931315 is a deficient number, since it is larger than the sum of its proper divisors (4213821373).

21064931315 is an equidigital number, since it uses as much as digits as its factorization.

21064931315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139189.

The product of its (nonzero) digits is 19440, while the sum is 35.

The spelling of 21064931315 in words is "twenty-one billion, sixty-four million, nine hundred thirty-one thousand, three hundred fifteen".