21030232 has 8 divisors (see below), whose sum is σ = 39431700. Its totient is φ = 10515112.

The previous prime is 21030227. The next prime is 21030239. The reversal of 21030232 is 23203012.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21030239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1314382 + ... + 1314397.

Almost surely, 2^21030232 is an apocalyptic number.

It is an amenable number.

21030232 is a deficient number, since it is larger than the sum of its proper divisors (18401468).

21030232 is a wasteful number, since it uses less digits than its factorization.

21030232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2628785 (or 2628781 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 21030232 is about 4585.8730902632. The cubic root of 21030232 is about 276.0247474834.

Adding to 21030232 its reverse (23203012), we get a palindrome (44233244).

The spelling of 21030232 in words is "twenty-one million, thirty thousand, two hundred thirty-two".