21252056804 has 24 divisors (see below), whose sum is σ = 40973821056. Its totient is φ = 9564380000.

The previous prime is 21252056801. The next prime is 21252056843. The reversal of 21252056804 is 40865025212.

It is not an unprimeable number, because it can be changed into a prime (21252056801) 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, 2386652 + ... + 2395539.

It is an arithmetic number, because the mean of its divisors is an integer number (1707242544).

Almost surely, 2^21252056804 is an apocalyptic number.

It is an amenable number.

21252056804 is a deficient number, since it is larger than the sum of its proper divisors (19721764252).

21252056804 is a wasteful number, since it uses less digits than its factorization.

21252056804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4782307 (or 4782305 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 35.

The spelling of 21252056804 in words is "twenty-one billion, two hundred fifty-two million, fifty-six thousand, eight hundred four".