21885152 has 12 divisors (see below), whose sum is σ = 43086456. Its totient is φ = 10942560.

The previous prime is 21885113. The next prime is 21885161. The reversal of 21885152 is 25158812.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 683911 = 21885152 / (2 + 1 + 8 + 8 + 5 + 1 + 5 + 2).

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, 341924 + ... + 341987.

It is an arithmetic number, because the mean of its divisors is an integer number (3590538).

Almost surely, 2^21885152 is an apocalyptic number.

It is an amenable number.

21885152 is a deficient number, since it is larger than the sum of its proper divisors (21201304).

21885152 is an equidigital number, since it uses as much as digits as its factorization.

21885152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683921 (or 683913 counting only the distinct ones).

The product of its digits is 6400, while the sum is 32.

The square root of 21885152 is about 4678.1569020288. The cubic root of 21885152 is about 279.7154933250.

The spelling of 21885152 in words is "twenty-one million, eight hundred eighty-five thousand, one hundred fifty-two".