21335330 has 8 divisors (see below), whose sum is σ = 38403612. Its totient is φ = 8534128.

The previous prime is 21335311. The next prime is 21335339. The reversal of 21335330 is 3353312.

It can be written as a sum of positive squares in 2 ways, for example, as 21335161 + 169 = 4619^2 + 13^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21335339) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1066757 + ... + 1066776.

Almost surely, 2^21335330 is an apocalyptic number.

21335330 is a deficient number, since it is larger than the sum of its proper divisors (17068282).

21335330 is a wasteful number, since it uses less digits than its factorization.

21335330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2133540.

The product of its (nonzero) digits is 810, while the sum is 20.

The square root of 21335330 is about 4619.0182939668. The cubic root of 21335330 is about 277.3531620412.

Adding to 21335330 its reverse (3353312), we get a palindrome (24688642).

The spelling of 21335330 in words is "twenty-one million, three hundred thirty-five thousand, three hundred thirty".