21320330 has 8 divisors (see below), whose sum is σ = 38376612. Its totient is φ = 8528128.

The previous prime is 21320323. The next prime is 21320401. The reversal of 21320330 is 3302312.

It can be written as a sum of positive squares in 2 ways, for example, as 21077281 + 243049 = 4591^2 + 493^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1066007 + ... + 1066026.

Almost surely, 2^21320330 is an apocalyptic number.

21320330 is a deficient number, since it is larger than the sum of its proper divisors (17056282).

21320330 is a wasteful number, since it uses less digits than its factorization.

21320330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2132040.

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

The square root of 21320330 is about 4617.3942868246. The cubic root of 21320330 is about 277.2881482388.

Adding to 21320330 its reverse (3302312), we get a palindrome (24622642).

The spelling of 21320330 in words is "twenty-one million, three hundred twenty thousand, three hundred thirty".