21823603972 has 24 divisors (see below), whose sum is σ = 39600005760. Its totient is φ = 10511064480.

The previous prime is 21823603909. The next prime is 21823603973. The reversal of 21823603972 is 27930632812.

It is not an unprimeable number, because it can be changed into a prime (21823603973) 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 7 ways as a sum of consecutive naturals, for example, 168258 + ... + 268249.

It is an arithmetic number, because the mean of its divisors is an integer number (1650000240).

Almost surely, 2^21823603972 is an apocalyptic number.

It is an amenable number.

21823603972 is a deficient number, since it is larger than the sum of its proper divisors (17776401788).

21823603972 is a wasteful number, since it uses less digits than its factorization.

21823603972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436971 (or 436969 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 43.

The spelling of 21823603972 in words is "twenty-one billion, eight hundred twenty-three million, six hundred three thousand, nine hundred seventy-two".