21335245 has 8 divisors (see below), whose sum is σ = 25641216. Its totient is φ = 17042256.

The previous prime is 21335231. The next prime is 21335257. The reversal of 21335245 is 54253312.

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 21335245 - 2⁷ = 21335117 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 844 + ... + 6586.

It is an arithmetic number, because the mean of its divisors is an integer number (3205152).

Almost surely, 2^21335245 is an apocalyptic number.

It is an amenable number.

21335245 is a deficient number, since it is larger than the sum of its proper divisors (4305971).

21335245 is an equidigital number, since it uses as much as digits as its factorization.

21335245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6491.

The product of its digits is 3600, while the sum is 25.

The square root of 21335245 is about 4619.0090928683. The cubic root of 21335245 is about 277.3527937155.

Adding to 21335245 its reverse (54253312), we get a palindrome (75588557).

The spelling of 21335245 in words is "twenty-one million, three hundred thirty-five thousand, two hundred forty-five".