12221018 has 4 divisors (see below), whose sum is σ = 18331530. Its totient is φ = 6110508.

The previous prime is 12220997. The next prime is 12221021. The reversal of 12221018 is 81012221.

It is a happy number.

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., 9320809 + 2900209 = 3053^2 + 1703^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12220987 and 12221005.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3055253 + ... + 3055256.

Almost surely, 2^12221018 is an apocalyptic number.

12221018 is a deficient number, since it is larger than the sum of its proper divisors (6110512).

12221018 is an equidigital number, since it uses as much as digits as its factorization.

12221018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6110511.

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

The square root of 12221018 is about 3495.8572625323. The cubic root of 12221018 is about 230.3398755835.

Adding to 12221018 its reverse (81012221), we get a palindrome (93233239).

The spelling of 12221018 in words is "twelve million, two hundred twenty-one thousand, eighteen".