21303119 has 4 divisors (see below), whose sum is σ = 21621144. Its totient is φ = 20985096.

The previous prime is 21303109. The next prime is 21303127. The reversal of 21303119 is 91130312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21303119 is a prime.

It is a super-2 number, since 2×21303119² = 907645758256322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21303119.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21303109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 158912 + ... + 159045.

It is an arithmetic number, because the mean of its divisors is an integer number (5405286).

Almost surely, 2^21303119 is an apocalyptic number.

21303119 is a deficient number, since it is larger than the sum of its proper divisors (318025).

21303119 is an equidigital number, since it uses as much as digits as its factorization.

21303119 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318024.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 21303119 is about 4615.5301970630. The cubic root of 21303119 is about 277.2135138236.

The spelling of 21303119 in words is "twenty-one million, three hundred three thousand, one hundred nineteen".