21879904339216 has 135 divisors (see below), whose sum is σ = 54207674156727. Its totient is φ = 8524076742720.

The previous prime is 21879904339187. The next prime is 21879904339243. The reversal of 21879904339216 is 61293340997812.

The square root of 21879904339216 is 4677596.

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

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1440691975 + ... + 1440707161.

Almost surely, 2^{21879904339216} is an apocalyptic number.

21879904339216 is the 4677596-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21879904339216

21879904339216 is an abundant number, since it is smaller than the sum of its proper divisors (32327769817511).

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

21879904339216 is an frugal number, since it uses more digits than its factorization.

21879904339216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30418 (or 15207 counting only the distinct ones).

The product of its (nonzero) digits is 35271936, while the sum is 64.

The spelling of 21879904339216 in words is "twenty-one trillion, eight hundred seventy-nine billion, nine hundred four million, three hundred thirty-nine thousand, two hundred sixteen".