21431452 has 12 divisors (see below), whose sum is σ = 42862960. Its totient is φ = 9184896.

The previous prime is 21431401. The next prime is 21431489. The reversal of 21431452 is 25413412.

21431452 is an admirable number.

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, 382677 + ... + 382732.

Almost surely, 2^21431452 is an apocalyptic number.

It is an amenable number.

21431452 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21431452 is a wasteful number, since it uses less digits than its factorization.

21431452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765420 (or 765418 counting only the distinct ones).

The product of its digits is 960, while the sum is 22.

The square root of 21431452 is about 4629.4116256820. The cubic root of 21431452 is about 277.7690575514.

Adding to 21431452 its reverse (25413412), we get a palindrome (46844864).

The spelling of 21431452 in words is "twenty-one million, four hundred thirty-one thousand, four hundred fifty-two".