21252324 has 12 divisors (see below), whose sum is σ = 49588784. Its totient is φ = 7084104.

The previous prime is 21252323. The next prime is 21252337. The reversal of 21252324 is 42325212.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×21252324² = 903322550801952, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21252324.

It is not an unprimeable number, because it can be changed into a prime (21252323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 885502 + ... + 885525.

Almost surely, 2^21252324 is an apocalyptic number.

It is an amenable number.

21252324 is an abundant number, since it is smaller than the sum of its proper divisors (28336460).

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

21252324 is a wasteful number, since it uses less digits than its factorization.

21252324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1771034 (or 1771032 counting only the distinct ones).

The product of its digits is 960, while the sum is 21.

The square root of 21252324 is about 4610.0242949468. The cubic root of 21252324 is about 276.9930098546.

Adding to 21252324 its reverse (42325212), we get a palindrome (63577536).

The spelling of 21252324 in words is "twenty-one million, two hundred fifty-two thousand, three hundred twenty-four".