21032330 has 32 divisors (see below), whose sum is σ = 41897088. Its totient is φ = 7537600.

The previous prime is 21032329. The next prime is 21032339. The reversal of 21032330 is 3323012.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21032339) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 6464 + ... + 9156.

It is an arithmetic number, because the mean of its divisors is an integer number (1309284).

Almost surely, 2^21032330 is an apocalyptic number.

21032330 is a deficient number, since it is larger than the sum of its proper divisors (20864758).

21032330 is a wasteful number, since it uses less digits than its factorization.

21032330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2782.

The product of its (nonzero) digits is 108, while the sum is 14.

The square root of 21032330 is about 4586.1018305310. The cubic root of 21032330 is about 276.0339260264.

Adding to 21032330 its reverse (3323012), we get a palindrome (24355342).

The spelling of 21032330 in words is "twenty-one million, thirty-two thousand, three hundred thirty".