21921166683 has 48 divisors (see below), whose sum is σ = 34518387904. Its totient is φ = 13324953600.

The previous prime is 21921166661. The next prime is 21921166691. The reversal of 21921166683 is 38666112912.

It is not a de Polignac number, because 21921166683 - 2²⁴ = 21904389467 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21921166643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5215983 + ... + 5220183.

Almost surely, 2^21921166683 is an apocalyptic number.

21921166683 is a deficient number, since it is larger than the sum of its proper divisors (12597221221).

21921166683 is a wasteful number, since it uses less digits than its factorization.

21921166683 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4756 (or 4753 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The spelling of 21921166683 in words is "twenty-one billion, nine hundred twenty-one million, one hundred sixty-six thousand, six hundred eighty-three".