21358299 has 16 divisors (see below), whose sum is σ = 30087680. Its totient is φ = 13439520.

The previous prime is 21358289. The next prime is 21358303. The reversal of 21358299 is 99285312.

It is a de Polignac number, because none of the positive numbers 2^k-21358299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21358219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20409 + ... + 21429.

It is an arithmetic number, because the mean of its divisors is an integer number (1880480).

Almost surely, 2^21358299 is an apocalyptic number.

21358299 is a deficient number, since it is larger than the sum of its proper divisors (8729381).

21358299 is a wasteful number, since it uses less digits than its factorization.

21358299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1410.

The product of its digits is 38880, while the sum is 39.

The square root of 21358299 is about 4621.5039759801. The cubic root of 21358299 is about 277.4526564798.

The spelling of 21358299 in words is "twenty-one million, three hundred fifty-eight thousand, two hundred ninety-nine".