21337245 has 24 divisors (see below), whose sum is σ = 37848096. Its totient is φ = 11114208.

The previous prime is 21337241. The next prime is 21337273. The reversal of 21337245 is 54273312.

It is not a de Polignac number, because 21337245 - 2² = 21337241 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21337241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3579 + ... + 7448.

It is an arithmetic number, because the mean of its divisors is an integer number (1577004).

Almost surely, 2^21337245 is an apocalyptic number.

It is an amenable number.

21337245 is a deficient number, since it is larger than the sum of its proper divisors (16510851).

21337245 is a wasteful number, since it uses less digits than its factorization.

21337245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11081 (or 11078 counting only the distinct ones).

The product of its digits is 5040, while the sum is 27.

The square root of 21337245 is about 4619.2255844459. The cubic root of 21337245 is about 277.3614599430.

The spelling of 21337245 in words is "twenty-one million, three hundred thirty-seven thousand, two hundred forty-five".