21716193 has 8 divisors (see below), whose sum is σ = 28993248. Its totient is φ = 14458304.

The previous prime is 21716159. The next prime is 21716237. The reversal of 21716193 is 39161712.

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 21716193 - 2¹⁴ = 21699809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21716193.

It is not an unprimeable number, because it can be changed into a prime (21716143) 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, 1896 + ... + 6857.

It is an arithmetic number, because the mean of its divisors is an integer number (3624156).

Almost surely, 2^21716193 is an apocalyptic number.

It is an amenable number.

21716193 is a deficient number, since it is larger than the sum of its proper divisors (7277055).

21716193 is an equidigital number, since it uses as much as digits as its factorization.

21716193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9583.

The product of its digits is 2268, while the sum is 30.

The square root of 21716193 is about 4660.0636261751. The cubic root of 21716193 is about 278.9938077530.

The spelling of 21716193 in words is "twenty-one million, seven hundred sixteen thousand, one hundred ninety-three".