21330355 has 8 divisors (see below), whose sum is σ = 25693200. Its totient is φ = 16999776.

The previous prime is 21330347. The next prime is 21330367. The reversal of 21330355 is 55303312.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21330355 - 2³ = 21330347 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6585 + ... + 9274.

It is an arithmetic number, because the mean of its divisors is an integer number (3211650).

Almost surely, 2^21330355 is an apocalyptic number.

21330355 is a deficient number, since it is larger than the sum of its proper divisors (4362845).

21330355 is a wasteful number, since it uses less digits than its factorization.

21330355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16133.

The product of its (nonzero) digits is 1350, while the sum is 22.

The square root of 21330355 is about 4618.4797282223. The cubic root of 21330355 is about 277.3316025084.

Adding to 21330355 its reverse (55303312), we get a palindrome (76633667).

The spelling of 21330355 in words is "twenty-one million, three hundred thirty thousand, three hundred fifty-five".