21576378795 has 32 divisors (see below), whose sum is σ = 34665076224. Its totient is φ = 11459884800.

The previous prime is 21576378773. The next prime is 21576378799. The reversal of 21576378795 is 59787367512.

It is a happy number.

It is not a de Polignac number, because 21576378795 - 2⁵ = 21576378763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21576378799) 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, 3834354 + ... + 3839976.

It is an arithmetic number, because the mean of its divisors is an integer number (1083283632).

Almost surely, 2^21576378795 is an apocalyptic number.

21576378795 is a deficient number, since it is larger than the sum of its proper divisors (13088697429).

21576378795 is a wasteful number, since it uses less digits than its factorization.

21576378795 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6643.

The product of its digits is 22226400, while the sum is 60.

The spelling of 21576378795 in words is "twenty-one billion, five hundred seventy-six million, three hundred seventy-eight thousand, seven hundred ninety-five".