18422321 has 2 divisors, whose sum is σ = 18422322. Its totient is φ = 18422320.

The previous prime is 18422311. The next prime is 18422329. The reversal of 18422321 is 12322481.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9541921 + 8880400 = 3089^2 + 2980^2 .

It is a cyclic number.

It is not a de Polignac number, because 18422321 - 2¹⁰ = 18421297 is a prime.

It is a super-2 number, since 2×18422321² = 678763822054082, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18422329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9211160 + 9211161.

It is an arithmetic number, because the mean of its divisors is an integer number (9211161).

Almost surely, 2^18422321 is an apocalyptic number.

It is an amenable number.

18422321 is a deficient number, since it is larger than the sum of its proper divisors (1).

18422321 is an equidigital number, since it uses as much as digits as its factorization.

18422321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 768, while the sum is 23.

The square root of 18422321 is about 4292.1231343008. The cubic root of 18422321 is about 264.1079343247.

It can be divided in two parts, 184223 and 21, that multiplied together give a palindrome (3868683).

The spelling of 18422321 in words is "eighteen million, four hundred twenty-two thousand, three hundred twenty-one".