12220018 has 4 divisors (see below), whose sum is σ = 18330030. Its totient is φ = 6110008.

The previous prime is 12220003. The next prime is 12220031. The reversal of 12220018 is 81002221.

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

It can be written as a sum of positive squares in only one way, i.e., 10067929 + 2152089 = 3173^2 + 1467^2 .

It is a super-3 number, since 3×12220018³ (a number of 22 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12219983 and 12220010.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3055003 + ... + 3055006.

Almost surely, 2^12220018 is an apocalyptic number.

12220018 is a deficient number, since it is larger than the sum of its proper divisors (6110012).

12220018 is an equidigital number, since it uses as much as digits as its factorization.

12220018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6110011.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 12220018 is about 3495.7142331718. The cubic root of 12220018 is about 230.3335927965. Note that the first 3 decimals are identical.

Adding to 12220018 its reverse (81002221), we get a palindrome (93222239).

The spelling of 12220018 in words is "twelve million, two hundred twenty thousand, eighteen".