21738299 has 16 divisors (see below), whose sum is σ = 25505280. Its totient is φ = 18315360.

The previous prime is 21738293. The next prime is 21738317. The reversal of 21738299 is 99283712.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21738299 - 2¹² = 21734203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21738293) 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, 8717 + ... + 10929.

It is an arithmetic number, because the mean of its divisors is an integer number (1594080).

Almost surely, 2^21738299 is an apocalyptic number.

21738299 is a deficient number, since it is larger than the sum of its proper divisors (3766981).

21738299 is a wasteful number, since it uses less digits than its factorization.

21738299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2290.

The product of its digits is 54432, while the sum is 41.

The square root of 21738299 is about 4662.4348789018. The cubic root of 21738299 is about 279.0884429036.

The spelling of 21738299 in words is "twenty-one million, seven hundred thirty-eight thousand, two hundred ninety-nine".