12221212 has 12 divisors (see below), whose sum is σ = 21411936. Its totient is φ = 6103520.

The previous prime is 12221207. The next prime is 12221233. The reversal of 12221212 is 21212221.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 12221192 and 12221201.

It is a congruent number.

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, 4893 + ... + 6955.

It is an arithmetic number, because the mean of its divisors is an integer number (1784328).

Almost surely, 2^12221212 is an apocalyptic number.

It is an amenable number.

12221212 is a deficient number, since it is larger than the sum of its proper divisors (9190724).

12221212 is a wasteful number, since it uses less digits than its factorization.

12221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3548 (or 3546 counting only the distinct ones).

The product of its digits is 32, while the sum is 13.

The square root of 12221212 is about 3495.8850095505. The cubic root of 12221212 is about 230.3410944045.

Adding to 12221212 its reverse (21212221), we get a palindrome (33433433).

The spelling of 12221212 in words is "twelve million, two hundred twenty-one thousand, two hundred twelve".