21301232 has 10 divisors (see below), whose sum is σ = 41271168. Its totient is φ = 10650608.

The previous prime is 21301229. The next prime is 21301253. The reversal of 21301232 is 23210312.

It is a happy number.

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 as a sum of consecutive naturals, namely, 665648 + ... + 665679.

Almost surely, 2^21301232 is an apocalyptic number.

It is an amenable number.

21301232 is a deficient number, since it is larger than the sum of its proper divisors (19969936).

21301232 is a wasteful number, since it uses less digits than its factorization.

21301232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1331335 (or 1331329 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 21301232 is about 4615.3257739839. The cubic root of 21301232 is about 277.2053285222.

Adding to 21301232 its reverse (23210312), we get a palindrome (44511544).

The spelling of 21301232 in words is "twenty-one million, three hundred one thousand, two hundred thirty-two".