21068043 has 8 divisors (see below), whose sum is σ = 28486656. Its totient is φ = 13847400.

The previous prime is 21068041. The next prime is 21068057. The reversal of 21068043 is 34086012.

It is a happy number.

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

It is not a de Polignac number, because 21068043 - 2¹ = 21068041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21068041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49243 + ... + 49668.

It is an arithmetic number, because the mean of its divisors is an integer number (3560832).

Almost surely, 2^21068043 is an apocalyptic number.

21068043 is a deficient number, since it is larger than the sum of its proper divisors (7418613).

21068043 is an equidigital number, since it uses as much as digits as its factorization.

21068043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98985.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 21068043 is about 4589.9937908455. The cubic root of 21068043 is about 276.1900733357.

The spelling of 21068043 in words is "twenty-one million, sixty-eight thousand, forty-three".