21194593 has 4 divisors (see below), whose sum is σ = 24222400. Its totient is φ = 18166788.

The previous prime is 21194587. The next prime is 21194627. The reversal of 21194593 is 39549112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21194593 - 2¹⁷ = 21063521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21194513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1513893 + ... + 1513906.

It is an arithmetic number, because the mean of its divisors is an integer number (6055600).

Almost surely, 2^21194593 is an apocalyptic number.

It is an amenable number.

21194593 is a deficient number, since it is larger than the sum of its proper divisors (3027807).

21194593 is an equidigital number, since it uses as much as digits as its factorization.

21194593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3027806.

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

The square root of 21194593 is about 4603.7585731661. The cubic root of 21194593 is about 276.7419693090.

The spelling of 21194593 in words is "twenty-one million, one hundred ninety-four thousand, five hundred ninety-three".