21303319 has 2 divisors, whose sum is σ = 21303320. Its totient is φ = 21303318.

The previous prime is 21303311. The next prime is 21303341. The reversal of 21303319 is 91330312.

It is an a-pointer prime, because the next prime (21303341) can be obtained adding 21303319 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21303319 - 2³ = 21303311 is a prime.

It is a super-2 number, since 2×21303319² = 907662800831522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21303319.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21303311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10651659 + 10651660.

It is an arithmetic number, because the mean of its divisors is an integer number (10651660).

Almost surely, 2^21303319 is an apocalyptic number.

21303319 is a deficient number, since it is larger than the sum of its proper divisors (1).

21303319 is an equidigital number, since it uses as much as digits as its factorization.

21303319 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 486, while the sum is 22.

The square root of 21303319 is about 4615.5518629954. The cubic root of 21303319 is about 277.2143813418.

The spelling of 21303319 in words is "twenty-one million, three hundred three thousand, three hundred nineteen".