21043193 has 8 divisors (see below), whose sum is σ = 21430656. Its totient is φ = 20658400.

The previous prime is 21043177. The next prime is 21043207. The reversal of 21043193 is 39134012.

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 21043193 - 2⁴ = 21043177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21043123) 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, 21605 + ... + 22557.

It is an arithmetic number, because the mean of its divisors is an integer number (2678832).

Almost surely, 2^21043193 is an apocalyptic number.

It is an amenable number.

21043193 is a deficient number, since it is larger than the sum of its proper divisors (387463).

21043193 is an equidigital number, since it uses as much as digits as its factorization.

21043193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1335.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 21043193 is about 4587.2860168078. The cubic root of 21043193 is about 276.0814408198.

The spelling of 21043193 in words is "twenty-one million, forty-three thousand, one hundred ninety-three".