21174252 has 48 divisors (see below), whose sum is σ = 55060992. Its totient is φ = 6278080.

The previous prime is 21174239. The next prime is 21174253. The reversal of 21174252 is 25247112.

It is not an unprimeable number, because it can be changed into a prime (21174253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4498 + ... + 7910.

It is an arithmetic number, because the mean of its divisors is an integer number (1147104).

Almost surely, 2^21174252 is an apocalyptic number.

21174252 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21174252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27530496).

21174252 is an abundant number, since it is smaller than the sum of its proper divisors (33886740).

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

21174252 is a wasteful number, since it uses less digits than its factorization.

21174252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3478 (or 3476 counting only the distinct ones).

The product of its digits is 1120, while the sum is 24.

The square root of 21174252 is about 4601.5488696742. The cubic root of 21174252 is about 276.6534088258.

The spelling of 21174252 in words is "twenty-one million, one hundred seventy-four thousand, two hundred fifty-two".