12228021 has 12 divisors (see below), whose sum is σ = 19021548. Its totient is φ = 7524864.

The previous prime is 12228017. The next prime is 12228023. The reversal of 12228021 is 12082221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1535121 + 10692900 = 1239^2 + 3270^2 .

It is not a de Polignac number, because 12228021 - 2² = 12228017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12227985 and 12228003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12228023) 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, 52140 + ... + 52373.

It is an arithmetic number, because the mean of its divisors is an integer number (1585129).

Almost surely, 2^12228021 is an apocalyptic number.

It is an amenable number.

12228021 is a deficient number, since it is larger than the sum of its proper divisors (6793527).

12228021 is a wasteful number, since it uses less digits than its factorization.

12228021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104532 (or 104529 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 12228021 is about 3496.8587332061. The cubic root of 12228021 is about 230.3838643395.

The spelling of 12228021 in words is "twelve million, two hundred twenty-eight thousand, twenty-one".