21230232 has 16 divisors (see below), whose sum is σ = 53075640. Its totient is φ = 7076736.

The previous prime is 21230227. The next prime is 21230243. The reversal of 21230232 is 23203212.

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, 442273 + ... + 442320.

Almost surely, 2^21230232 is an apocalyptic number.

It is an amenable number.

21230232 is an abundant number, since it is smaller than the sum of its proper divisors (31845408).

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

21230232 is a wasteful number, since it uses less digits than its factorization.

21230232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884602 (or 884598 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 21230232 is about 4607.6275891179. The cubic root of 21230232 is about 276.8969975915.

Adding to 21230232 its reverse (23203212), we get a palindrome (44433444).

The spelling of 21230232 in words is "twenty-one million, two hundred thirty thousand, two hundred thirty-two".