21337385 has 8 divisors (see below), whose sum is σ = 25663176. Its totient is φ = 17031040.

The previous prime is 21337369. The next prime is 21337439. The reversal of 21337385 is 58373312.

It can be written as a sum of positive squares in 4 ways, for example, as 29929 + 21307456 = 173^2 + 4616^2 .

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

It is not a de Polignac number, because 21337385 - 2⁴ = 21337369 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 2324 + ... + 6933.

It is an arithmetic number, because the mean of its divisors is an integer number (3207897).

Almost surely, 2^21337385 is an apocalyptic number.

It is an amenable number.

21337385 is a deficient number, since it is larger than the sum of its proper divisors (4325791).

21337385 is an equidigital number, since it uses as much as digits as its factorization.

21337385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9723.

The product of its digits is 15120, while the sum is 32.

The square root of 21337385 is about 4619.2407384764. The cubic root of 21337385 is about 277.3620665586.

The spelling of 21337385 in words is "twenty-one million, three hundred thirty-seven thousand, three hundred eighty-five".