21470432 has 12 divisors (see below), whose sum is σ = 42269976. Its totient is φ = 10735200.

The previous prime is 21470419. The next prime is 21470441. The reversal of 21470432 is 23407412.

It is a junction number, because it is equal to n+sod(n) for n = 21470398 and 21470407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335444 + ... + 335507.

It is an arithmetic number, because the mean of its divisors is an integer number (3522498).

Almost surely, 2^21470432 is an apocalyptic number.

It is an amenable number.

21470432 is a deficient number, since it is larger than the sum of its proper divisors (20799544).

21470432 is an equidigital number, since it uses as much as digits as its factorization.

21470432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670961 (or 670953 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 23.

The square root of 21470432 is about 4633.6197513391. The cubic root of 21470432 is about 277.9373597286.

Adding to 21470432 its reverse (23407412), we get a palindrome (44877844).

The spelling of 21470432 in words is "twenty-one million, four hundred seventy thousand, four hundred thirty-two".