21332330 has 32 divisors (see below), whose sum is σ = 39312000. Its totient is φ = 8332992.

The previous prime is 21332329. The next prime is 21332347. The reversal of 21332330 is 3323312.

It is a junction number, because it is equal to n+sod(n) for n = 21332299 and 21332308.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143096 + ... + 143244.

It is an arithmetic number, because the mean of its divisors is an integer number (1228500).

Almost surely, 2^21332330 is an apocalyptic number.

21332330 is a deficient number, since it is larger than the sum of its proper divisors (17979670).

21332330 is a wasteful number, since it uses less digits than its factorization.

21332330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398.

The product of its (nonzero) digits is 324, while the sum is 17.

The square root of 21332330 is about 4618.6935382205. The cubic root of 21332330 is about 277.3401617191.

Adding to 21332330 its reverse (3323312), we get a palindrome (24655642).

The spelling of 21332330 in words is "twenty-one million, three hundred thirty-two thousand, three hundred thirty".