21323452 has 12 divisors (see below), whose sum is σ = 37659160. Its totient is φ = 10563696.

The previous prime is 21323441. The next prime is 21323473. The reversal of 21323452 is 25432312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24018 + ... + 24889.

Almost surely, 2^21323452 is an apocalyptic number.

It is an amenable number.

21323452 is a deficient number, since it is larger than the sum of its proper divisors (16335708).

21323452 is a wasteful number, since it uses less digits than its factorization.

21323452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49020 (or 49018 counting only the distinct ones).

The product of its digits is 1440, while the sum is 22.

The square root of 21323452 is about 4617.7323439108. The cubic root of 21323452 is about 277.3016822905.

Adding to 21323452 its reverse (25432312), we get a palindrome (46755764).

The spelling of 21323452 in words is "twenty-one million, three hundred twenty-three thousand, four hundred fifty-two".