21650372315 has 16 divisors (see below), whose sum is σ = 30522483936. Its totient is φ = 14534515200.

The previous prime is 21650372279. The next prime is 21650372407. The reversal of 21650372315 is 51327305612.

It is not a de Polignac number, because 21650372315 - 2⁸ = 21650372059 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, 15139406 + ... + 15140835.

It is an arithmetic number, because the mean of its divisors is an integer number (1907655246).

Almost surely, 2^21650372315 is an apocalyptic number.

21650372315 is a deficient number, since it is larger than the sum of its proper divisors (8872111621).

21650372315 is a wasteful number, since it uses less digits than its factorization.

21650372315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30280270.

The product of its (nonzero) digits is 37800, while the sum is 35.

Adding to 21650372315 its reverse (51327305612), we get a palindrome (72977677927).

The spelling of 21650372315 in words is "twenty-one billion, six hundred fifty million, three hundred seventy-two thousand, three hundred fifteen".