21330299 has 2 divisors, whose sum is σ = 21330300. Its totient is φ = 21330298.

The previous prime is 21330271. The next prime is 21330311. The reversal of 21330299 is 99203312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21330299 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21330259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665149 + 10665150.

It is an arithmetic number, because the mean of its divisors is an integer number (10665150).

Almost surely, 2^21330299 is an apocalyptic number.

21330299 is a deficient number, since it is larger than the sum of its proper divisors (1).

21330299 is an equidigital number, since it uses as much as digits as its factorization.

21330299 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 21330299 is about 4618.4736656172. The cubic root of 21330299 is about 277.3313598091.

The spelling of 21330299 in words is "twenty-one million, three hundred thirty thousand, two hundred ninety-nine".