21841243 has 8 divisors (see below), whose sum is σ = 23239440. Its totient is φ = 20455680.

The previous prime is 21841217. The next prime is 21841273. The reversal of 21841243 is 34214812.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21841243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21841273) 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 7 ways as a sum of consecutive naturals, for example, 543 + ... + 6631.

It is an arithmetic number, because the mean of its divisors is an integer number (2904930).

Almost surely, 2^21841243 is an apocalyptic number.

21841243 is a deficient number, since it is larger than the sum of its proper divisors (1398197).

21841243 is a wasteful number, since it uses less digits than its factorization.

21841243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6317.

The product of its digits is 1536, while the sum is 25.

The square root of 21841243 is about 4673.4615650500. The cubic root of 21841243 is about 279.5283001886.

The spelling of 21841243 in words is "twenty-one million, eight hundred forty-one thousand, two hundred forty-three".