21338849 has 8 divisors (see below), whose sum is σ = 24721920. Its totient is φ = 18039456.

The previous prime is 21338833. The next prime is 21338851. The reversal of 21338849 is 94883312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21338849 - 2⁴ = 21338833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21338749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20369 + ... + 21390.

It is an arithmetic number, because the mean of its divisors is an integer number (3090240).

Almost surely, 2^21338849 is an apocalyptic number.

It is an amenable number.

21338849 is a deficient number, since it is larger than the sum of its proper divisors (3383071).

21338849 is an equidigital number, since it uses as much as digits as its factorization.

21338849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41839.

The product of its digits is 41472, while the sum is 38.

The square root of 21338849 is about 4619.3992033597. The cubic root of 21338849 is about 277.3684098660.

The spelling of 21338849 in words is "twenty-one million, three hundred thirty-eight thousand, eight hundred forty-nine".