21668953352 has 16 divisors (see below), whose sum is σ = 42030297900. Its totient is φ = 10460873920.

The previous prime is 21668953331. The next prime is 21668953357. The reversal of 21668953352 is 25335986612.

It can be written as a sum of positive squares in 2 ways, for example, as 20464446916 + 1204506436 = 143054^2 + 34706^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21668953352.

It is not an unprimeable number, because it can be changed into a prime (21668953357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46700099 + ... + 46700562.

Almost surely, 2^21668953352 is an apocalyptic number.

It is an amenable number.

21668953352 is a deficient number, since it is larger than the sum of its proper divisors (20361344548).

21668953352 is a wasteful number, since it uses less digits than its factorization.

21668953352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93400696 (or 93400692 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 50.

The spelling of 21668953352 in words is "twenty-one billion, six hundred sixty-eight million, nine hundred fifty-three thousand, three hundred fifty-two".