18022211 has 4 divisors (see below), whose sum is σ = 18101832. Its totient is φ = 17942592.

The previous prime is 18022201. The next prime is 18022217. The reversal of 18022211 is 11222081.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18022211 - 2¹⁰ = 18021187 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18022211.

It is not an unprimeable number, because it can be changed into a prime (18022217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39470 + ... + 39923.

It is an arithmetic number, because the mean of its divisors is an integer number (4525458).

Almost surely, 2^18022211 is an apocalyptic number.

18022211 is a deficient number, since it is larger than the sum of its proper divisors (79621).

18022211 is an equidigital number, since it uses as much as digits as its factorization.

18022211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79620.

The product of its (nonzero) digits is 64, while the sum is 17.

The square root of 18022211 is about 4245.2574715793. The cubic root of 18022211 is about 262.1818900897.

Adding to 18022211 its reverse (11222081), we get a palindrome (29244292).

The spelling of 18022211 in words is "eighteen million, twenty-two thousand, two hundred eleven".