18213201 has 8 divisors (see below), whose sum is σ = 26982560. Its totient is φ = 12142116.

The previous prime is 18213199. The next prime is 18213203. The reversal of 18213201 is 10231281.

It is an interprime number because it is at equal distance from previous prime (18213199) and next prime (18213203).

It is not a de Polignac number, because 18213201 - 2¹ = 18213199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18213203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 337255 + ... + 337308.

It is an arithmetic number, because the mean of its divisors is an integer number (3372820).

Almost surely, 2^18213201 is an apocalyptic number.

It is an amenable number.

18213201 is a deficient number, since it is larger than the sum of its proper divisors (8769359).

18213201 is an equidigital number, since it uses as much as digits as its factorization.

18213201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674572 (or 674566 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 18213201 is about 4267.6927021518. The cubic root of 18213201 is about 263.1047932568.

Adding to 18213201 its reverse (10231281), we get a palindrome (28444482).

The spelling of 18213201 in words is "eighteen million, two hundred thirteen thousand, two hundred one".