21902299 has 2 divisors, whose sum is σ = 21902300. Its totient is φ = 21902298.

The previous prime is 21902297. The next prime is 21902317. The reversal of 21902299 is 99220912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21902299 - 2¹ = 21902297 is a prime.

Together with 21902297, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21902291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10951149 + 10951150.

It is an arithmetic number, because the mean of its divisors is an integer number (10951150).

Almost surely, 2^21902299 is an apocalyptic number.

21902299 is a deficient number, since it is larger than the sum of its proper divisors (1).

21902299 is an equidigital number, since it uses as much as digits as its factorization.

21902299 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 21902299 is about 4679.9892093893. The cubic root of 21902299 is about 279.7885265468.

It can be divided in two parts, 21902 and 299, that added together give a square (22201 = 149²).

The spelling of 21902299 in words is "twenty-one million, nine hundred two thousand, two hundred ninety-nine".