21220372204 has 48 divisors (see below), whose sum is σ = 38230192000. Its totient is φ = 10300711680.

The previous prime is 21220372177. The next prime is 21220372211. The reversal of 21220372204 is 40227302212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37163239 + ... + 37163809.

Almost surely, 2^21220372204 is an apocalyptic number.

It is an amenable number.

21220372204 is a deficient number, since it is larger than the sum of its proper divisors (17009819796).

21220372204 is a wasteful number, since it uses less digits than its factorization.

21220372204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550 (or 1548 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 25.

Adding to 21220372204 its reverse (40227302212), we get a palindrome (61447674416).

The spelling of 21220372204 in words is "twenty-one billion, two hundred twenty million, three hundred seventy-two thousand, two hundred four".