21983572 has 12 divisors (see below), whose sum is σ = 41430676. Its totient is φ = 10146240.

The previous prime is 21983569. The next prime is 21983579. The reversal of 21983572 is 27538912.

It can be written as a sum of positive squares in 2 ways, for example, as 1153476 + 20830096 = 1074^2 + 4564^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21983579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211329 + ... + 211432.

Almost surely, 2^21983572 is an apocalyptic number.

It is an amenable number.

21983572 is a deficient number, since it is larger than the sum of its proper divisors (19447104).

21983572 is a wasteful number, since it uses less digits than its factorization.

21983572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422778 (or 422776 counting only the distinct ones).

The product of its digits is 30240, while the sum is 37.

The square root of 21983572 is about 4688.6642020942. The cubic root of 21983572 is about 280.1341703918.

The spelling of 21983572 in words is "twenty-one million, nine hundred eighty-three thousand, five hundred seventy-two".