21303113 has 4 divisors (see below), whose sum is σ = 22941828. Its totient is φ = 19664400.

The previous prime is 21303109. The next prime is 21303127. The reversal of 21303113 is 31130312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12759184 + 8543929 = 3572^2 + 2923^2 .

It is a cyclic number.

It is not a de Polignac number, because 21303113 - 2² = 21303109 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21303143) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 819338 + ... + 819363.

It is an arithmetic number, because the mean of its divisors is an integer number (5735457).

Almost surely, 2^21303113 is an apocalyptic number.

It is an amenable number.

21303113 is a deficient number, since it is larger than the sum of its proper divisors (1638715).

21303113 is a wasteful number, since it uses less digits than its factorization.

21303113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1638714.

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

The square root of 21303113 is about 4615.5295470834. The cubic root of 21303113 is about 277.2134877980.

Adding to 21303113 its reverse (31130312), we get a palindrome (52433425).

The spelling of 21303113 in words is "twenty-one million, three hundred three thousand, one hundred thirteen".