21298593 has 8 divisors (see below), whose sum is σ = 28444608. Its totient is φ = 14175824.

The previous prime is 21298583. The next prime is 21298681. The reversal of 21298593 is 39589212.

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 21298593 - 2⁵ = 21298561 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21298573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3546 + ... + 7427.

It is an arithmetic number, because the mean of its divisors is an integer number (3555576).

Almost surely, 2^21298593 is an apocalyptic number.

It is an amenable number.

21298593 is a deficient number, since it is larger than the sum of its proper divisors (7146015).

21298593 is a wasteful number, since it uses less digits than its factorization.

21298593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11623.

The product of its digits is 38880, while the sum is 39.

The square root of 21298593 is about 4615.0398698169. The cubic root of 21298593 is about 277.1938804352.

The spelling of 21298593 in words is "twenty-one million, two hundred ninety-eight thousand, five hundred ninety-three".