21825245564 has 24 divisors (see below), whose sum is σ = 38580796800. Its totient is φ = 10802247984.

The previous prime is 21825245543. The next prime is 21825245621. The reversal of 21825245564 is 46554252812.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1145387 + ... + 1164285.

It is an arithmetic number, because the mean of its divisors is an integer number (1607533200).

Almost surely, 2^21825245564 is an apocalyptic number.

It is an amenable number.

21825245564 is a deficient number, since it is larger than the sum of its proper divisors (16755551236).

21825245564 is a wasteful number, since it uses less digits than its factorization.

21825245564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21809 (or 21807 counting only the distinct ones).

The product of its digits is 768000, while the sum is 44.

The spelling of 21825245564 in words is "twenty-one billion, eight hundred twenty-five million, two hundred forty-five thousand, five hundred sixty-four".