21895252 has 24 divisors (see below), whose sum is σ = 40861800. Its totient is φ = 10229760.

The previous prime is 21895229. The next prime is 21895267. The reversal of 21895252 is 25259812.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3111696 + 18783556 = 1764^2 + 4334^2 .

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9052 + ... + 11212.

It is an arithmetic number, because the mean of its divisors is an integer number (1702575).

Almost surely, 2^21895252 is an apocalyptic number.

It is an amenable number.

21895252 is a deficient number, since it is larger than the sum of its proper divisors (18966548).

21895252 is a wasteful number, since it uses less digits than its factorization.

21895252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2331 (or 2329 counting only the distinct ones).

The product of its digits is 14400, while the sum is 34.

The square root of 21895252 is about 4679.2362624685. The cubic root of 21895252 is about 279.7585162840.

The spelling of 21895252 in words is "twenty-one million, eight hundred ninety-five thousand, two hundred fifty-two".