21430452 has 24 divisors (see below), whose sum is σ = 50853600. Its totient is φ = 7022176.

The previous prime is 21430447. The next prime is 21430477. The reversal of 21430452 is 25403412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14427 + ... + 15842.

It is an arithmetic number, because the mean of its divisors is an integer number (2118900).

Almost surely, 2^21430452 is an apocalyptic number.

It is an amenable number.

21430452 is an abundant number, since it is smaller than the sum of its proper divisors (29423148).

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

21430452 is a wasteful number, since it uses less digits than its factorization.

21430452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30335 (or 30333 counting only the distinct ones).

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

The square root of 21430452 is about 4629.3036193363. The cubic root of 21430452 is about 277.7647372130.

Adding to 21430452 its reverse (25403412), we get a palindrome (46833864).

The spelling of 21430452 in words is "twenty-one million, four hundred thirty thousand, four hundred fifty-two".