21232330 has 64 divisors (see below), whose sum is σ = 45722880. Its totient is φ = 6948864.

The previous prime is 21232307. The next prime is 21232363. The reversal of 21232330 is 3323212.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 218842 + ... + 218938.

It is an arithmetic number, because the mean of its divisors is an integer number (714420).

Almost surely, 2^21232330 is an apocalyptic number.

21232330 is an abundant number, since it is smaller than the sum of its proper divisors (24490550).

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

21232330 is a wasteful number, since it uses less digits than its factorization.

21232330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223.

The product of its (nonzero) digits is 216, while the sum is 16.

The square root of 21232330 is about 4607.8552494626. The cubic root of 21232330 is about 276.9061184020.

Adding to 21232330 its reverse (3323212), we get a palindrome (24555542).

The spelling of 21232330 in words is "twenty-one million, two hundred thirty-two thousand, three hundred thirty".