18421301 has 4 divisors (see below), whose sum is σ = 18919212. Its totient is φ = 17923392.

The previous prime is 18421297. The next prime is 18421303. The reversal of 18421301 is 10312481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10312481 = 1423 ⋅7247.

It can be written as a sum of positive squares in 2 ways, for example, as 14638276 + 3783025 = 3826^2 + 1945^2 .

It is not a de Polignac number, because 18421301 - 2² = 18421297 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18421303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 248900 + ... + 248973.

It is an arithmetic number, because the mean of its divisors is an integer number (4729803).

Almost surely, 2^18421301 is an apocalyptic number.

It is an amenable number.

18421301 is a deficient number, since it is larger than the sum of its proper divisors (497911).

18421301 is an equidigital number, since it uses as much as digits as its factorization.

18421301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497910.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 18421301 is about 4292.0043103427. The cubic root of 18421301 is about 264.1030598925.

Adding to 18421301 its reverse (10312481), we get a palindrome (28733782).

The spelling of 18421301 in words is "eighteen million, four hundred twenty-one thousand, three hundred one".