21113303 has 12 divisors (see below), whose sum is σ = 22755600. Its totient is φ = 19521216.

The previous prime is 21113299. The next prime is 21113317. The reversal of 21113303 is 30331112.

It is not a de Polignac number, because 21113303 - 2² = 21113299 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21118303) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 105998 + ... + 106196.

It is an arithmetic number, because the mean of its divisors is an integer number (1896300).

Almost surely, 2^21113303 is an apocalyptic number.

21113303 is a deficient number, since it is larger than the sum of its proper divisors (1642297).

21113303 is an equidigital number, since it uses as much as digits as its factorization.

21113303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374 (or 295 counting only the distinct ones).

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

The square root of 21113303 is about 4594.9214356722. The cubic root of 21113303 is about 276.3877095055.

Adding to 21113303 its reverse (30331112), we get a palindrome (51444415).

The spelling of 21113303 in words is "twenty-one million, one hundred thirteen thousand, three hundred three".