18421303 has 2 divisors, whose sum is σ = 18421304. Its totient is φ = 18421302.

The previous prime is 18421297. The next prime is 18421339. The reversal of 18421303 is 30312481.

It is a weak prime.

It is an emirp because it is prime and its reverse (30312481) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18421303 - 2⁹ = 18420791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18421343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9210651 + 9210652.

It is an arithmetic number, because the mean of its divisors is an integer number (9210652).

Almost surely, 2^18421303 is an apocalyptic number.

18421303 is a deficient number, since it is larger than the sum of its proper divisors (1).

18421303 is an equidigital number, since it uses as much as digits as its factorization.

18421303 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 18421303 is about 4292.0045433340. The cubic root of 18421303 is about 264.1030694504.

Adding to 18421303 its reverse (30312481), we get a palindrome (48733784).

The spelling of 18421303 in words is "eighteen million, four hundred twenty-one thousand, three hundred three".