21593149 has 8 divisors (see below), whose sum is σ = 21951360. Its totient is φ = 21237216.

The previous prime is 21593147. The next prime is 21593153. The reversal of 21593149 is 94139512.

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 21593149 - 2¹ = 21593147 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21593141) 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, 34689 + ... + 35305.

It is an arithmetic number, because the mean of its divisors is an integer number (2743920).

Almost surely, 2^21593149 is an apocalyptic number.

It is an amenable number.

21593149 is a deficient number, since it is larger than the sum of its proper divisors (358211).

21593149 is an equidigital number, since it uses as much as digits as its factorization.

21593149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1139.

The product of its digits is 9720, while the sum is 34.

The square root of 21593149 is about 4646.8429067486. The cubic root of 21593149 is about 278.4658828985.

The spelling of 21593149 in words is "twenty-one million, five hundred ninety-three thousand, one hundred forty-nine".