21915024761 has 32 divisors (see below), whose sum is σ = 26373907200. Its totient is φ = 17812327680.

The previous prime is 21915024727. The next prime is 21915024763. The reversal of 21915024761 is 16742051912.

It is not a de Polignac number, because 21915024761 - 2⁶ = 21915024697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21915024763) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15019850 + ... + 15021308.

It is an arithmetic number, because the mean of its divisors is an integer number (824184600).

Almost surely, 2^21915024761 is an apocalyptic number.

It is an amenable number.

21915024761 is a deficient number, since it is larger than the sum of its proper divisors (4458882439).

21915024761 is a wasteful number, since it uses less digits than its factorization.

21915024761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2769.

The product of its (nonzero) digits is 30240, while the sum is 38.

The spelling of 21915024761 in words is "twenty-one billion, nine hundred fifteen million, twenty-four thousand, seven hundred sixty-one".