21252364 has 24 divisors (see below), whose sum is σ = 43309728. Its totient is φ = 8935680.

The previous prime is 21252353. The next prime is 21252367. The reversal of 21252364 is 46325212.

It is not an unprimeable number, because it can be changed into a prime (21252367) 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, 5677 + ... + 8644.

It is an arithmetic number, because the mean of its divisors is an integer number (1804572).

Almost surely, 2^21252364 is an apocalyptic number.

It is an amenable number.

21252364 is an abundant number, since it is smaller than the sum of its proper divisors (22057364).

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

21252364 is a wasteful number, since it uses less digits than its factorization.

21252364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14385 (or 14383 counting only the distinct ones).

The product of its digits is 2880, while the sum is 25.

The square root of 21252364 is about 4610.0286333167. The cubic root of 21252364 is about 276.9931836350.

Adding to 21252364 its reverse (46325212), we get a palindrome (67577576).

It can be divided in two parts, 2125 and 2364, that added together give a square (4489 = 67²).

The spelling of 21252364 in words is "twenty-one million, two hundred fifty-two thousand, three hundred sixty-four".