21900299 has 2 divisors, whose sum is σ = 21900300. Its totient is φ = 21900298.

The previous prime is 21900283. The next prime is 21900313. The reversal of 21900299 is 99200912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21900299 - 2⁴ = 21900283 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (21900259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10950149 + 10950150.

It is an arithmetic number, because the mean of its divisors is an integer number (10950150).

Almost surely, 2^21900299 is an apocalyptic number.

21900299 is a deficient number, since it is larger than the sum of its proper divisors (1).

21900299 is an equidigital number, since it uses as much as digits as its factorization.

21900299 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 32.

The square root of 21900299 is about 4679.7755288048. The cubic root of 21900299 is about 279.7800100270.

The spelling of 21900299 in words is "twenty-one million, nine hundred thousand, two hundred ninety-nine".