18007211 has 4 divisors (see below), whose sum is σ = 18065424. Its totient is φ = 17949000.

The previous prime is 18007207. The next prime is 18007237. The reversal of 18007211 is 11270081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11270081 = 31 ⋅363551.

It is a cyclic number.

It is not a de Polignac number, because 18007211 - 2² = 18007207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18007201) 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, 28640 + ... + 29261.

It is an arithmetic number, because the mean of its divisors is an integer number (4516356).

Almost surely, 2^18007211 is an apocalyptic number.

18007211 is a deficient number, since it is larger than the sum of its proper divisors (58213).

18007211 is an equidigital number, since it uses as much as digits as its factorization.

18007211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58212.

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 18007211 is about 4243.4904265239. The cubic root of 18007211 is about 262.1091313526.

Adding to 18007211 its reverse (11270081), we get a palindrome (29277292).

The spelling of 18007211 in words is "eighteen million, seven thousand, two hundred eleven".