21464299 has 2 divisors, whose sum is σ = 21464300. Its totient is φ = 21464298.

The previous prime is 21464297. The next prime is 21464309. The reversal of 21464299 is 99246412.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21464299 - 2¹ = 21464297 is a prime.

It is a super-2 number, since 2×21464299² = 921432263122802, which contains 22 as substring.

Together with 21464297, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21464291) 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, 10732149 + 10732150.

It is an arithmetic number, because the mean of its divisors is an integer number (10732150).

Almost surely, 2^21464299 is an apocalyptic number.

21464299 is a deficient number, since it is larger than the sum of its proper divisors (1).

21464299 is an equidigital number, since it uses as much as digits as its factorization.

21464299 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 37.

The square root of 21464299 is about 4632.9579104499. The cubic root of 21464299 is about 277.9108930641.

The spelling of 21464299 in words is "twenty-one million, four hundred sixty-four thousand, two hundred ninety-nine".