12212428 has 12 divisors (see below), whose sum is σ = 21396312. Its totient is φ = 6099200.

The previous prime is 12212423. The next prime is 12212429. The reversal of 12212428 is 82421221.

12212428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 12212399 and 12212408.

It is not an unprimeable number, because it can be changed into a prime (12212423) 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, 5451 + ... + 7357.

It is an arithmetic number, because the mean of its divisors is an integer number (1783026).

Almost surely, 2^12212428 is an apocalyptic number.

It is an amenable number.

12212428 is a deficient number, since it is larger than the sum of its proper divisors (9183884).

12212428 is a wasteful number, since it uses less digits than its factorization.

12212428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3512 (or 3510 counting only the distinct ones).

The product of its digits is 512, while the sum is 22.

The square root of 12212428 is about 3494.6284494922. The cubic root of 12212428 is about 230.2858952660.

Adding to 12212428 its reverse (82421221), we get a palindrome (94633649).

The spelling of 12212428 in words is "twelve million, two hundred twelve thousand, four hundred twenty-eight".