21170193 has 8 divisors (see below), whose sum is σ = 30793056. Its totient is φ = 12830400.

The previous prime is 21170159. The next prime is 21170207. The reversal of 21170193 is 39107112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21170193 - 2⁸ = 21169937 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (21170113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 320728 + ... + 320793.

It is an arithmetic number, because the mean of its divisors is an integer number (3849132).

Almost surely, 2^21170193 is an apocalyptic number.

It is an amenable number.

21170193 is a deficient number, since it is larger than the sum of its proper divisors (9622863).

21170193 is a wasteful number, since it uses less digits than its factorization.

21170193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641535.

The product of its (nonzero) digits is 378, while the sum is 24.

The square root of 21170193 is about 4601.1078013887. The cubic root of 21170193 is about 276.6357299967.

The spelling of 21170193 in words is "twenty-one million, one hundred seventy thousand, one hundred ninety-three".