21153299 has 2 divisors, whose sum is σ = 21153300. Its totient is φ = 21153298.

The previous prime is 21153281. The next prime is 21153323. The reversal of 21153299 is 99235112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21153299 - 2⁸ = 21153043 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21153259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10576649 + 10576650.

It is an arithmetic number, because the mean of its divisors is an integer number (10576650).

Almost surely, 2^21153299 is an apocalyptic number.

21153299 is a deficient number, since it is larger than the sum of its proper divisors (1).

21153299 is an equidigital number, since it uses as much as digits as its factorization.

21153299 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4860, while the sum is 32.

The square root of 21153299 is about 4599.2715727602. The cubic root of 21153299 is about 276.5621244997.

The spelling of 21153299 in words is "twenty-one million, one hundred fifty-three thousand, two hundred ninety-nine".