21723932879236 has 27 divisors (see below), whose sum is σ = 44223853340037. Its totient is φ = 9310228982880.

The previous prime is 21723932879177. The next prime is 21723932879291. The reversal of 21723932879236 is 63297823932712.

It is a happy number.

The square root of 21723932879236 is 4660894.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 16973625448836 + 4750307430400 = 4119906^2 + 2179520^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 65086056 + ... + 65418976.

Almost surely, 2^{21723932879236} is an apocalyptic number.

21723932879236 is the 4660894-th square number.

It is an amenable number.

21723932879236 is an abundant number, since it is smaller than the sum of its proper divisors (22499920460801).

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

21723932879236 is an frugal number, since it uses more digits than its factorization.

21723932879236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665860 (or 332930 counting only the distinct ones).

The product of its digits is 82301184, while the sum is 64.

The spelling of 21723932879236 in words is "twenty-one trillion, seven hundred twenty-three billion, nine hundred thirty-two million, eight hundred seventy-nine thousand, two hundred thirty-six".