21774252 has 24 divisors (see below), whose sum is σ = 50885632. Its totient is φ = 7246800.

The previous prime is 21774251. The next prime is 21774253. The reversal of 21774252 is 25247712.

It is an interprime number because it is at equal distance from previous prime (21774251) and next prime (21774253).

It is not an unprimeable number, because it can be changed into a prime (21774251) 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, 10977 + ... + 12807.

Almost surely, 2^21774252 is an apocalyptic number.

It is an amenable number.

21774252 is an abundant number, since it is smaller than the sum of its proper divisors (29111380).

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

21774252 is a wasteful number, since it uses less digits than its factorization.

21774252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2829 (or 2827 counting only the distinct ones).

The product of its digits is 7840, while the sum is 30.

The square root of 21774252 is about 4666.2888894709. The cubic root of 21774252 is about 279.2422197328.

The spelling of 21774252 in words is "twenty-one million, seven hundred seventy-four thousand, two hundred fifty-two".