21854252 has 24 divisors (see below), whose sum is σ = 43893024. Its totient is φ = 9326592.

The previous prime is 21854251. The next prime is 21854263. The reversal of 21854252 is 25245812.

It is not an unprimeable number, because it can be changed into a prime (21854251) 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, 5678 + ... + 8714.

It is an arithmetic number, because the mean of its divisors is an integer number (1828876).

Almost surely, 2^21854252 is an apocalyptic number.

It is an amenable number.

21854252 is an abundant number, since it is smaller than the sum of its proper divisors (22038772).

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

21854252 is a wasteful number, since it uses less digits than its factorization.

21854252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3305 (or 3303 counting only the distinct ones).

The product of its digits is 6400, while the sum is 29.

The square root of 21854252 is about 4674.8531527739. The cubic root of 21854252 is about 279.5837863764.

The spelling of 21854252 in words is "twenty-one million, eight hundred fifty-four thousand, two hundred fifty-two".