21829972236 has 24 divisors (see below), whose sum is σ = 51011198784. Its totient is φ = 7266000720.

The previous prime is 21829972189. The next prime is 21829972249. The reversal of 21829972236 is 63227992812.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1323550 + ... + 1339941.

It is an arithmetic number, because the mean of its divisors is an integer number (2125466616).

Almost surely, 2^21829972236 is an apocalyptic number.

It is an amenable number.

21829972236 is an abundant number, since it is smaller than the sum of its proper divisors (29181226548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21829972236 is a wasteful number, since it uses less digits than its factorization.

21829972236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2664181 (or 2664179 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 51.

The spelling of 21829972236 in words is "twenty-one billion, eight hundred twenty-nine million, nine hundred seventy-two thousand, two hundred thirty-six".