21493249 has 8 divisors (see below), whose sum is σ = 22410432. Its totient is φ = 20595120.

The previous prime is 21493243. The next prime is 21493259. The reversal of 21493249 is 94239412.

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 21493249 - 2⁵ = 21493217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21493243) 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, 2437 + ... + 6994.

It is an arithmetic number, because the mean of its divisors is an integer number (2801304).

Almost surely, 2^21493249 is an apocalyptic number.

It is an amenable number.

21493249 is a deficient number, since it is larger than the sum of its proper divisors (917183).

21493249 is an equidigital number, since it uses as much as digits as its factorization.

21493249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9527.

The product of its digits is 15552, while the sum is 34.

The square root of 21493249 is about 4636.0812115406. The cubic root of 21493249 is about 278.0357811543.

The spelling of 21493249 in words is "twenty-one million, four hundred ninety-three thousand, two hundred forty-nine".