21789652 has 12 divisors (see below), whose sum is σ = 39362176. Its totient is φ = 10543320.

The previous prime is 21789641. The next prime is 21789653. The reversal of 21789652 is 25698712.

It is a super-2 number, since 2×21789652² = 949577868562208, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21789653) 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, 87738 + ... + 87985.

Almost surely, 2^21789652 is an apocalyptic number.

It is an amenable number.

21789652 is a deficient number, since it is larger than the sum of its proper divisors (17572524).

21789652 is a wasteful number, since it uses less digits than its factorization.

21789652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175758 (or 175756 counting only the distinct ones).

The product of its digits is 60480, while the sum is 40.

The square root of 21789652 is about 4667.9387313888. The cubic root of 21789652 is about 279.3080362573.

The spelling of 21789652 in words is "twenty-one million, seven hundred eighty-nine thousand, six hundred fifty-two".