21113330 has 16 divisors (see below), whose sum is σ = 43433280. Its totient is φ = 7238832.

The previous prime is 21113329. The next prime is 21113357. The reversal of 21113330 is 3331112.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150740 + ... + 150879.

It is an arithmetic number, because the mean of its divisors is an integer number (2714580).

Almost surely, 2^21113330 is an apocalyptic number.

21113330 is an abundant number, since it is smaller than the sum of its proper divisors (22319950).

21113330 is a wasteful number, since it uses less digits than its factorization.

21113330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301633.

The product of its (nonzero) digits is 54, while the sum is 14.

The square root of 21113330 is about 4594.9243736976. The cubic root of 21113330 is about 276.3878273216.

Adding to 21113330 its reverse (3331112), we get a palindrome (24444442).

The spelling of 21113330 in words is "twenty-one million, one hundred thirteen thousand, three hundred thirty".