21094843 has 16 divisors (see below), whose sum is σ = 26841600. Its totient is φ = 16434600.

The previous prime is 21094831. The next prime is 21094859. The reversal of 21094843 is 34849012.

It is a de Polignac number, because none of the positive numbers 2^k-21094843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21094813) 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 15 ways as a sum of consecutive naturals, for example, 978 + ... + 6568.

It is an arithmetic number, because the mean of its divisors is an integer number (1677600).

Almost surely, 2^21094843 is an apocalyptic number.

21094843 is a deficient number, since it is larger than the sum of its proper divisors (5746757).

21094843 is an equidigital number, since it uses as much as digits as its factorization.

21094843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5623 (or 5609 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 21094843 is about 4592.9122569455. The cubic root of 21094843 is about 276.3071346373.

The spelling of 21094843 in words is "twenty-one million, ninety-four thousand, eight hundred forty-three".