21451650299 has 2 divisors, whose sum is σ = 21451650300. Its totient is φ = 21451650298.

The previous prime is 21451650229. The next prime is 21451650323. The reversal of 21451650299 is 99205615412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21451650299 - 2²⁰ = 21450601723 is a prime.

It is not a weakly prime, because it can be changed into another prime (21451650229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10725825149 + 10725825150.

It is an arithmetic number, because the mean of its divisors is an integer number (10725825150).

Almost surely, 2^21451650299 is an apocalyptic number.

21451650299 is a deficient number, since it is larger than the sum of its proper divisors (1).

21451650299 is an equidigital number, since it uses as much as digits as its factorization.

21451650299 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 194400, while the sum is 44.

The spelling of 21451650299 in words is "twenty-one billion, four hundred fifty-one million, six hundred fifty thousand, two hundred ninety-nine".