21116299 has 2 divisors, whose sum is σ = 21116300. Its totient is φ = 21116298.

The previous prime is 21116297. The next prime is 21116317. The reversal of 21116299 is 99261112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21116299 - 2¹ = 21116297 is a prime.

Together with 21116297, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21116299.

It is not a weakly prime, because it can be changed into another prime (21116297) 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, 10558149 + 10558150.

It is an arithmetic number, because the mean of its divisors is an integer number (10558150).

Almost surely, 2^21116299 is an apocalyptic number.

21116299 is a deficient number, since it is larger than the sum of its proper divisors (1).

21116299 is an equidigital number, since it uses as much as digits as its factorization.

21116299 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 31.

The square root of 21116299 is about 4595.2474362106. The cubic root of 21116299 is about 276.4007821231.

The spelling of 21116299 in words is "twenty-one million, one hundred sixteen thousand, two hundred ninety-nine".