21693165796 has 9 divisors (see below), whose sum is σ = 37963555651. Its totient is φ = 10846435612.

The previous prime is 21693165779. The next prime is 21693165817. The reversal of 21693165796 is 69756139612.

The square root of 21693165796 is 147286.

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

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 257751 + ... + 331393.

Almost surely, 2^21693165796 is an apocalyptic number.

21693165796 is the 147286-th square number.

It is an amenable number.

21693165796 is a deficient number, since it is larger than the sum of its proper divisors (16270389855).

21693165796 is an frugal number, since it uses more digits than its factorization.

21693165796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147290 (or 73645 counting only the distinct ones).

The product of its digits is 3674160, while the sum is 55.

It can be divided in two parts, 21693 and 165796, that added together give a square (187489 = 433²).

The spelling of 21693165796 in words is "twenty-one billion, six hundred ninety-three million, one hundred sixty-five thousand, seven hundred ninety-six".