21843361 has 2 divisors, whose sum is σ = 21843362. Its totient is φ = 21843360.

The previous prime is 21843347. The next prime is 21843373. The reversal of 21843361 is 16334812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19140625 + 2702736 = 4375^2 + 1644^2 .

It is a cyclic number.

It is not a de Polignac number, because 21843361 - 2⁷ = 21843233 is a prime.

It is not a weakly prime, because it can be changed into another prime (21843461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10921680 + 10921681.

It is an arithmetic number, because the mean of its divisors is an integer number (10921681).

Almost surely, 2^21843361 is an apocalyptic number.

It is an amenable number.

21843361 is a deficient number, since it is larger than the sum of its proper divisors (1).

21843361 is an equidigital number, since it uses as much as digits as its factorization.

21843361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 28.

The square root of 21843361 is about 4673.6881581894. The cubic root of 21843361 is about 279.5373354162.

The spelling of 21843361 in words is "twenty-one million, eight hundred forty-three thousand, three hundred sixty-one".