21283319 has 2 divisors, whose sum is σ = 21283320. Its totient is φ = 21283318.

The previous prime is 21283313. The next prime is 21283331. The reversal of 21283319 is 91338212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21283319 is a prime.

It is a super-2 number, since 2×21283319² = 905959335311522, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21283291 and 21283300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21283313) 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 as a sum of consecutive naturals, namely, 10641659 + 10641660.

It is an arithmetic number, because the mean of its divisors is an integer number (10641660).

Almost surely, 2^21283319 is an apocalyptic number.

21283319 is a deficient number, since it is larger than the sum of its proper divisors (1).

21283319 is an equidigital number, since it uses as much as digits as its factorization.

21283319 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 29.

The square root of 21283319 is about 4613.3847660909. The cubic root of 21283319 is about 277.1276026327.

The spelling of 21283319 in words is "twenty-one million, two hundred eighty-three thousand, three hundred nineteen".