21847343 has 16 divisors (see below), whose sum is σ = 26105856. Its totient is φ = 17889120.

The previous prime is 21847303. The next prime is 21847349. The reversal of 21847343 is 34374812.

It is a cyclic number.

It is not a de Polignac number, because 21847343 - 2¹² = 21843247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21847349) 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, 17405 + ... + 18617.

It is an arithmetic number, because the mean of its divisors is an integer number (1631616).

Almost surely, 2^21847343 is an apocalyptic number.

21847343 is a deficient number, since it is larger than the sum of its proper divisors (4258513).

21847343 is a wasteful number, since it uses less digits than its factorization.

21847343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334.

The product of its digits is 16128, while the sum is 32.

The square root of 21847343 is about 4674.1141406688. The cubic root of 21847343 is about 279.5543207454.

The spelling of 21847343 in words is "twenty-one million, eight hundred forty-seven thousand, three hundred forty-three".