21939015999 has 8 divisors (see below), whose sum is σ = 29317172400. Its totient is φ = 14593435136.

The previous prime is 21939015979. The next prime is 21939016009. The reversal of 21939015999 is 99951093912.

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

It is a cyclic number.

It is not a de Polignac number, because 21939015999 - 2²⁰ = 21937967423 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21939015979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8142312 + ... + 8145005.

It is an arithmetic number, because the mean of its divisors is an integer number (3664646550).

Almost surely, 2^21939015999 is an apocalyptic number.

21939015999 is a deficient number, since it is larger than the sum of its proper divisors (7378156401).

21939015999 is a wasteful number, since it uses less digits than its factorization.

21939015999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16287769.

The product of its (nonzero) digits is 1771470, while the sum is 57.

The spelling of 21939015999 in words is "twenty-one billion, nine hundred thirty-nine million, fifteen thousand, nine hundred ninety-nine".