12211428 has 24 divisors (see below), whose sum is σ = 28702240. Its totient is φ = 4040640.

The previous prime is 12211421. The next prime is 12211447. The reversal of 12211428 is 82411221.

12211428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (12211421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1993 + ... + 5328.

Almost surely, 2^12211428 is an apocalyptic number.

It is an amenable number.

12211428 is an abundant number, since it is smaller than the sum of its proper divisors (16490812).

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

12211428 is a wasteful number, since it uses less digits than its factorization.

12211428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7467 (or 7465 counting only the distinct ones).

The product of its digits is 256, while the sum is 21.

The square root of 12211428 is about 3494.4853698363. The cubic root of 12211428 is about 230.2796095331.

Adding to 12211428 its reverse (82411221), we get a palindrome (94622649).

The spelling of 12211428 in words is "twelve million, two hundred eleven thousand, four hundred twenty-eight".