21024299 has 2 divisors, whose sum is σ = 21024300. Its totient is φ = 21024298.

The previous prime is 21024271. The next prime is 21024313. The reversal of 21024299 is 99242012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21024299 is a prime.

It is a super-2 number, since 2×21024299² = 884042296882802, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (21024209) 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, 10512149 + 10512150.

It is an arithmetic number, because the mean of its divisors is an integer number (10512150).

Almost surely, 2^21024299 is an apocalyptic number.

21024299 is a deficient number, since it is larger than the sum of its proper divisors (1).

21024299 is an equidigital number, since it uses as much as digits as its factorization.

21024299 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

The square root of 21024299 is about 4585.2261667229. The cubic root of 21024299 is about 275.9987878894.

The spelling of 21024299 in words is "twenty-one million, twenty-four thousand, two hundred ninety-nine".