21223204625 has 96 divisors (see below), whose sum is σ = 32113635840. Its totient is φ = 13949712000.

The previous prime is 21223204609. The next prime is 21223204627. The reversal of 21223204625 is 52640232212.

It is not a de Polignac number, because 21223204625 - 2⁴ = 21223204609 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21223204627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 16089716 + ... + 16091034.

It is an arithmetic number, because the mean of its divisors is an integer number (334517040).

Almost surely, 2^21223204625 is an apocalyptic number.

21223204625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21223204625 is a deficient number, since it is larger than the sum of its proper divisors (10890431215).

21223204625 is a wasteful number, since it uses less digits than its factorization.

21223204625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1456 (or 1439 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 21223204625 its reverse (52640232212), we get a palindrome (73863436837).

The spelling of 21223204625 in words is "twenty-one billion, two hundred twenty-three million, two hundred four thousand, six hundred twenty-five".