12220556 has 12 divisors (see below), whose sum is σ = 21412440. Its totient is φ = 6102720.

The previous prime is 12220543. The next prime is 12220561. The reversal of 12220556 is 65502221.

12220556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 3380 + ... + 5988.

It is an arithmetic number, because the mean of its divisors is an integer number (1784370).

Almost surely, 2^12220556 is an apocalyptic number.

It is an amenable number.

12220556 is a deficient number, since it is larger than the sum of its proper divisors (9191884).

12220556 is a wasteful number, since it uses less digits than its factorization.

12220556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3784 (or 3782 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 12220556 is about 3495.7911836950. The cubic root of 12220556 is about 230.3369729785.

Adding to 12220556 its reverse (65502221), we get a palindrome (77722777).

The spelling of 12220556 in words is "twelve million, two hundred twenty thousand, five hundred fifty-six".