21338297 has 4 divisors (see below), whose sum is σ = 21414516. Its totient is φ = 21262080.

The previous prime is 21338293. The next prime is 21338299. The reversal of 21338297 is 79283312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14661241 + 6677056 = 3829^2 + 2584^2 .

It is a cyclic number.

It is not a de Polignac number, because 21338297 - 2² = 21338293 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21338293) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37688 + ... + 38249.

It is an arithmetic number, because the mean of its divisors is an integer number (5353629).

Almost surely, 2^21338297 is an apocalyptic number.

It is an amenable number.

21338297 is a deficient number, since it is larger than the sum of its proper divisors (76219).

21338297 is an equidigital number, since it uses as much as digits as its factorization.

21338297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76218.

The product of its digits is 18144, while the sum is 35.

The square root of 21338297 is about 4619.3394549437. The cubic root of 21338297 is about 277.3660181612.

The spelling of 21338297 in words is "twenty-one million, three hundred thirty-eight thousand, two hundred ninety-seven".