12221740 has 36 divisors (see below), whose sum is σ = 26946864. Its totient is φ = 4647456.

The previous prime is 12221689. The next prime is 12221749. The reversal of 12221740 is 4712221.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (12221749) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74899 + ... + 75061.

It is an arithmetic number, because the mean of its divisors is an integer number (748524).

Almost surely, 2^12221740 is an apocalyptic number.

12221740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12221740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13473432).

12221740 is an abundant number, since it is smaller than the sum of its proper divisors (14725124).

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

12221740 is a wasteful number, since it uses less digits than its factorization.

12221740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358 (or 193 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 19.

The square root of 12221740 is about 3495.9605260929. The cubic root of 12221740 is about 230.3444115427.

Adding to 12221740 its reverse (4712221), we get a palindrome (16933961).

The spelling of 12221740 in words is "twelve million, two hundred twenty-one thousand, seven hundred forty".