21635652 has 24 divisors (see below), whose sum is σ = 50605632. Its totient is φ = 7194400.

The previous prime is 21635641. The next prime is 21635657. The reversal of 21635652 is 25653612.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21635657) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3577 + ... + 7487.

It is an arithmetic number, because the mean of its divisors is an integer number (2108568).

Almost surely, 2^21635652 is an apocalyptic number.

It is an amenable number.

21635652 is an abundant number, since it is smaller than the sum of its proper divisors (28969980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21635652 is a wasteful number, since it uses less digits than its factorization.

21635652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4379 (or 4377 counting only the distinct ones).

The product of its digits is 10800, while the sum is 30.

The square root of 21635652 is about 4651.4139785661. The cubic root of 21635652 is about 278.6484697971.

The spelling of 21635652 in words is "twenty-one million, six hundred thirty-five thousand, six hundred fifty-two".