12211445 has 4 divisors (see below), whose sum is σ = 14653740. Its totient is φ = 9769152.

The previous prime is 12211421. The next prime is 12211447. The reversal of 12211445 is 54411221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54411221 = 29 ⋅1876249.

It can be written as a sum of positive squares in 2 ways, for example, as 6345361 + 5866084 = 2519^2 + 2422^2 .

It is a cyclic number.

It is not a de Polignac number, because 12211445 - 2²⁰ = 11162869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211447) 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, 1221140 + ... + 1221149.

It is an arithmetic number, because the mean of its divisors is an integer number (3663435).

Almost surely, 2^12211445 is an apocalyptic number.

It is an amenable number.

12211445 is a deficient number, since it is larger than the sum of its proper divisors (2442295).

12211445 is an equidigital number, since it uses as much as digits as its factorization.

12211445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2442294.

The product of its digits is 320, while the sum is 20.

The square root of 12211445 is about 3494.4878022394. The cubic root of 12211445 is about 230.2797163935.

Adding to 12211445 its reverse (54411221), we get a palindrome (66622666).

The spelling of 12211445 in words is "twelve million, two hundred eleven thousand, four hundred forty-five".