21650205315 has 32 divisors (see below), whose sum is σ = 35186112000. Its totient is φ = 11365491456.

The previous prime is 21650205307. The next prime is 21650205323. The reversal of 21650205315 is 51350205612.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21650205307) and next prime (21650205323).

It is not a de Polignac number, because 21650205315 - 2³ = 21650205307 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 526594 + ... + 566216.

It is an arithmetic number, because the mean of its divisors is an integer number (1099566000).

Almost surely, 2^21650205315 is an apocalyptic number.

21650205315 is a deficient number, since it is larger than the sum of its proper divisors (13535906685).

21650205315 is a wasteful number, since it uses less digits than its factorization.

21650205315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40203.

The product of its (nonzero) digits is 9000, while the sum is 30.

The spelling of 21650205315 in words is "twenty-one billion, six hundred fifty million, two hundred five thousand, three hundred fifteen".