21163315256315 has 16 divisors (see below), whose sum is σ = 26008655000256. Its totient is φ = 16526923056000.

The previous prime is 21163315256273. The next prime is 21163315256339. The reversal of 21163315256315 is 51365251336112.

It is not a de Polignac number, because 21163315256315 - 2¹⁶ = 21163315190779 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 295087772 + ... + 295159481.

It is an arithmetic number, because the mean of its divisors is an integer number (1625540937516).

Almost surely, 2^{21163315256315} is an apocalyptic number.

21163315256315 is a deficient number, since it is larger than the sum of its proper divisors (4845339743941).

21163315256315 is a wasteful number, since it uses less digits than its factorization.

21163315256315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590247430.

The product of its digits is 486000, while the sum is 44.

The spelling of 21163315256315 in words is "twenty-one trillion, one hundred sixty-three billion, three hundred fifteen million, two hundred fifty-six thousand, three hundred fifteen".