18221341 has 2 divisors, whose sum is σ = 18221342. Its totient is φ = 18221340.

The previous prime is 18221339. The next prime is 18221389. The reversal of 18221341 is 14312281.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14784025 + 3437316 = 3845^2 + 1854^2 .

It is an emirp because it is prime and its reverse (14312281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18221341 - 2¹ = 18221339 is a prime.

Together with 18221339, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18221041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9110670 + 9110671.

It is an arithmetic number, because the mean of its divisors is an integer number (9110671).

Almost surely, 2^18221341 is an apocalyptic number.

It is an amenable number.

18221341 is a deficient number, since it is larger than the sum of its proper divisors (1).

18221341 is an equidigital number, since it uses as much as digits as its factorization.

18221341 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 22.

The square root of 18221341 is about 4268.6462725318. The cubic root of 18221341 is about 263.1439837692.

The spelling of 18221341 in words is "eighteen million, two hundred twenty-one thousand, three hundred forty-one".