21432430 has 8 divisors (see below), whose sum is σ = 38578392. Its totient is φ = 8572968.

The previous prime is 21432413. The next prime is 21432443. The reversal of 21432430 is 3423412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21432398 and 21432407.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1071612 + ... + 1071631.

It is an arithmetic number, because the mean of its divisors is an integer number (4822299).

Almost surely, 2^21432430 is an apocalyptic number.

21432430 is a deficient number, since it is larger than the sum of its proper divisors (17145962).

21432430 is a wasteful number, since it uses less digits than its factorization.

21432430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2143250.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 21432430 is about 4629.5172534509. The cubic root of 21432430 is about 277.7732827124.

Adding to 21432430 its reverse (3423412), we get a palindrome (24855842).

The spelling of 21432430 in words is "twenty-one million, four hundred thirty-two thousand, four hundred thirty".