21994343 has 16 divisors (see below), whose sum is σ = 26903040. Its totient is φ = 17560800.

The previous prime is 21994333. The next prime is 21994363. The reversal of 21994343 is 34349912.

It is a cyclic number.

It is not a de Polignac number, because 21994343 - 2¹⁰ = 21993319 is a prime.

It is a super-2 number, since 2×21994343² = 967502248003298, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21994333) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6758 + ... + 9468.

It is an arithmetic number, because the mean of its divisors is an integer number (1681440).

Almost surely, 2^21994343 is an apocalyptic number.

21994343 is a deficient number, since it is larger than the sum of its proper divisors (4908697).

21994343 is a wasteful number, since it uses less digits than its factorization.

21994343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2798.

The product of its digits is 23328, while the sum is 35.

The square root of 21994343 is about 4689.8126828265. The cubic root of 21994343 is about 280.1799141332.

It can be divided in two parts, 219943 and 43, that multiplied together give a palindrome (9457549).

The spelling of 21994343 in words is "twenty-one million, nine hundred ninety-four thousand, three hundred forty-three".