21904823577 has 16 divisors (see below), whose sum is σ = 35946377600. Its totient is φ = 11554192512.

The previous prime is 21904823573. The next prime is 21904823587. The reversal of 21904823577 is 77532840912.

It is a happy number.

It is not a de Polignac number, because 21904823577 - 2² = 21904823573 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21904823573) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40118452 + ... + 40118997.

It is an arithmetic number, because the mean of its divisors is an integer number (2246648600).

Almost surely, 2^21904823577 is an apocalyptic number.

It is an amenable number.

21904823577 is a deficient number, since it is larger than the sum of its proper divisors (14041554023).

21904823577 is a wasteful number, since it uses less digits than its factorization.

21904823577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80237472.

The product of its (nonzero) digits is 846720, while the sum is 48.

The spelling of 21904823577 in words is "twenty-one billion, nine hundred four million, eight hundred twenty-three thousand, five hundred seventy-seven".