21330010 has 32 divisors (see below), whose sum is σ = 42239232. Its totient is φ = 7705920.

The previous prime is 21329999. The next prime is 21330047. The reversal of 21330010 is 1003312.

It is a Harshad number since it is a multiple of its sum of digits (10).

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, 4365 + ... + 7855.

It is an arithmetic number, because the mean of its divisors is an integer number (1319976).

Almost surely, 2^21330010 is an apocalyptic number.

21330010 is a deficient number, since it is larger than the sum of its proper divisors (20909222).

21330010 is a wasteful number, since it uses less digits than its factorization.

21330010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3558.

The product of its (nonzero) digits is 18, while the sum is 10.

The square root of 21330010 is about 4618.4423781184. The cubic root of 21330010 is about 277.3301073009.

Adding to 21330010 its reverse (1003312), we get a palindrome (22333322).

The spelling of 21330010 in words is "twenty-one million, three hundred thirty thousand, ten".