21883986772 has 6 divisors (see below), whose sum is σ = 38296976858. Its totient is φ = 10941993384.

The previous prime is 21883986749. The next prime is 21883986781. The reversal of 21883986772 is 27768938812.

It can be written as a sum of positive squares in only one way, i.e., 17648059716 + 4235927056 = 132846^2 + 65084^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21883986772.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2735498343 + ... + 2735498350.

Almost surely, 2^21883986772 is an apocalyptic number.

It is an amenable number.

21883986772 is a deficient number, since it is larger than the sum of its proper divisors (16412990086).

21883986772 is a wasteful number, since it uses less digits than its factorization.

21883986772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5470996697 (or 5470996695 counting only the distinct ones).

The product of its digits is 16257024, while the sum is 61.

The spelling of 21883986772 in words is "twenty-one billion, eight hundred eighty-three million, nine hundred eighty-six thousand, seven hundred seventy-two".