12221642 has 8 divisors (see below), whose sum is σ = 18387876. Its totient is φ = 6092352.

The previous prime is 12221611. The next prime is 12221669. The reversal of 12221642 is 24612221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 11895601 + 326041 = 3449^2 + 571^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8393 + ... + 9740.

Almost surely, 2^12221642 is an apocalyptic number.

12221642 is a deficient number, since it is larger than the sum of its proper divisors (6166234).

12221642 is a wasteful number, since it uses less digits than its factorization.

12221642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18472.

The product of its digits is 384, while the sum is 20.

The square root of 12221642 is about 3495.9465098883. The cubic root of 12221642 is about 230.3437958689.

Adding to 12221642 its reverse (24612221), we get a palindrome (36833863).

The spelling of 12221642 in words is "twelve million, two hundred twenty-one thousand, six hundred forty-two".