18121201 has 32 divisors (see below), whose sum is σ = 23328000. Its totient is φ = 13719552.

The previous prime is 18121163. The next prime is 18121211. The reversal of 18121201 is 10212181.

It is not a de Polignac number, because 18121201 - 2⁷ = 18121073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18121211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 203565 + ... + 203653.

It is an arithmetic number, because the mean of its divisors is an integer number (729000).

Almost surely, 2^18121201 is an apocalyptic number.

It is an amenable number.

18121201 is a deficient number, since it is larger than the sum of its proper divisors (5206799).

18121201 is a wasteful number, since it uses less digits than its factorization.

18121201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201.

The product of its (nonzero) digits is 32, while the sum is 16.

The square root of 18121201 is about 4256.9003981771. The cubic root of 18121201 is about 262.6610398086.

Adding to 18121201 its reverse (10212181), we get a palindrome (28333382).

The spelling of 18121201 in words is "eighteen million, one hundred twenty-one thousand, two hundred one".