21923299 has 2 divisors, whose sum is σ = 21923300. Its totient is φ = 21923298.

The previous prime is 21923273. The next prime is 21923311. The reversal of 21923299 is 99232912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21923299 - 2⁵ = 21923267 is a prime.

It is equal to p_1384696 and since 21923299 and 1384696 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (21923269) 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, 10961649 + 10961650.

It is an arithmetic number, because the mean of its divisors is an integer number (10961650).

Almost surely, 2^21923299 is an apocalyptic number.

21923299 is a deficient number, since it is larger than the sum of its proper divisors (1).

21923299 is an equidigital number, since it uses as much as digits as its factorization.

21923299 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 37.

The square root of 21923299 is about 4682.2322667719. The cubic root of 21923299 is about 279.8779187185.

It can be divided in two parts, 21923 and 299, that added together give a palindrome (22222).

The spelling of 21923299 in words is "twenty-one million, nine hundred twenty-three thousand, two hundred ninety-nine".