21944343 has 4 divisors (see below), whose sum is σ = 29259128. Its totient is φ = 14629560.

The previous prime is 21944333. The next prime is 21944357. The reversal of 21944343 is 34344912.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-21944343 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21944343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21944303) 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 3 ways as a sum of consecutive naturals, for example, 3657388 + ... + 3657393.

It is an arithmetic number, because the mean of its divisors is an integer number (7314782).

Almost surely, 2^21944343 is an apocalyptic number.

21944343 is a deficient number, since it is larger than the sum of its proper divisors (7314785).

21944343 is an equidigital number, since it uses as much as digits as its factorization.

21944343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7314784.

The product of its digits is 10368, while the sum is 30.

The square root of 21944343 is about 4684.4789464785. The cubic root of 21944343 is about 279.9674409420.

The spelling of 21944343 in words is "twenty-one million, nine hundred forty-four thousand, three hundred forty-three".