21676808858896 has 45 divisors (see below), whose sum is σ = 44326345004613. Its totient is φ = 10267794480960.

The previous prime is 21676808858857. The next prime is 21676808858911. The reversal of 21676808858896 is 69885880867612.

The square root of 21676808858896 is 4655836.

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., 4191699348496 + 17485109510400 = 2047364^2 + 4181520^2 .

It is a super-2 number, since 2×21676808858896² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

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, 353812906 + ... + 353874166.

Almost surely, 2^{21676808858896} is an apocalyptic number.

21676808858896 is the 4655836-th square number.

It is an amenable number.

21676808858896 is an abundant number, since it is smaller than the sum of its proper divisors (22649536145717).

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

21676808858896 is an frugal number, since it uses more digits than its factorization.

21676808858896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122568 (or 61282 counting only the distinct ones).

The product of its (nonzero) digits is 4459069440, while the sum is 82.

The spelling of 21676808858896 in words is "twenty-one trillion, six hundred seventy-six billion, eight hundred eight million, eight hundred fifty-eight thousand, eight hundred ninety-six".