21841343 has 4 divisors (see below), whose sum is σ = 21857208. Its totient is φ = 21825480.

The previous prime is 21841331. The next prime is 21841349. The reversal of 21841343 is 34314812.

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

It is a cyclic number.

It is not a de Polignac number, because 21841343 - 2⁴ = 21841327 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21841349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5648 + ... + 8693.

It is an arithmetic number, because the mean of its divisors is an integer number (5464302).

Almost surely, 2^21841343 is an apocalyptic number.

21841343 is a deficient number, since it is larger than the sum of its proper divisors (15865).

21841343 is a wasteful number, since it uses less digits than its factorization.

21841343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15864.

The product of its digits is 2304, while the sum is 26.

The square root of 21841343 is about 4673.4722637457. The cubic root of 21841343 is about 279.5287267941.

The spelling of 21841343 in words is "twenty-one million, eight hundred forty-one thousand, three hundred forty-three".