21804758472 has 64 divisors (see below), whose sum is σ = 62672440320. Its totient is φ = 6192618048.

The previous prime is 21804758453. The next prime is 21804758483. The reversal of 21804758472 is 27485740812.

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, 360538 + ... + 416649.

It is an arithmetic number, because the mean of its divisors is an integer number (979256880).

Almost surely, 2^21804758472 is an apocalyptic number.

It is an amenable number.

21804758472 is an abundant number, since it is smaller than the sum of its proper divisors (40867681848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21804758472 is a wasteful number, since it uses less digits than its factorization.

21804758472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 777370 (or 777366 counting only the distinct ones).

The product of its (nonzero) digits is 1003520, while the sum is 48.

The spelling of 21804758472 in words is "twenty-one billion, eight hundred four million, seven hundred fifty-eight thousand, four hundred seventy-two".