12221201212 has 12 divisors (see below), whose sum is σ = 23331384216. Its totient is φ = 5555091440.

The previous prime is 12221201189. The next prime is 12221201219. The reversal of 12221201212 is 21210212221.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221201219) 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, 138877243 + ... + 138877330.

It is an arithmetic number, because the mean of its divisors is an integer number (1944282018).

Almost surely, 2^12221201212 is an apocalyptic number.

It is an amenable number.

12221201212 is a deficient number, since it is larger than the sum of its proper divisors (11110183004).

12221201212 is a wasteful number, since it uses less digits than its factorization.

12221201212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277754588 (or 277754586 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 12221201212 its reverse (21210212221), we get a palindrome (33431413433).

The spelling of 12221201212 in words is "twelve billion, two hundred twenty-one million, two hundred one thousand, two hundred twelve".