21564079713796 has 27 divisors (see below), whose sum is σ = 39828165666471. Its totient is φ = 10214480488104.

The previous prime is 21564079713751. The next prime is 21564079713797. The reversal of 21564079713796 is 69731797046512.

The square root of 21564079713796 is 4643714.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21564079713797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 176400031 + ... + 176522233.

Almost surely, 2^{21564079713796} is an apocalyptic number.

21564079713796 is the 4643714-th square number.

It is an amenable number.

21564079713796 is a deficient number, since it is larger than the sum of its proper divisors (18264085952675).

21564079713796 is an frugal number, since it uses more digits than its factorization.

21564079713796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244448 (or 122224 counting only the distinct ones).

The product of its (nonzero) digits is 120022560, while the sum is 67.

The spelling of 21564079713796 in words is "twenty-one trillion, five hundred sixty-four billion, seventy-nine million, seven hundred thirteen thousand, seven hundred ninety-six".