12221140 has 12 divisors (see below), whose sum is σ = 25664436. Its totient is φ = 4888448.

The previous prime is 12221117. The next prime is 12221171. The reversal of 12221140 is 4112221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1449616 + 10771524 = 1204^2 + 3282^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12221140.

It is a congruent number.

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, 305509 + ... + 305548.

It is an arithmetic number, because the mean of its divisors is an integer number (2138703).

Almost surely, 2^12221140 is an apocalyptic number.

12221140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12221140 is an abundant number, since it is smaller than the sum of its proper divisors (13443296).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12221140 is a wasteful number, since it uses less digits than its factorization.

12221140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611066 (or 611064 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 12221140 is about 3495.8747117138. The cubic root of 12221140 is about 230.3406420601.

Adding to 12221140 its reverse (4112221), we get a palindrome (16333361).

The spelling of 12221140 in words is "twelve million, two hundred twenty-one thousand, one hundred forty".