12001221212 has 12 divisors (see below), whose sum is σ = 21130985736. Its totient is φ = 5963796720.

The previous prime is 12001221187. The next prime is 12001221217. The reversal of 12001221212 is 21212210021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001221217) 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, 9202739 + ... + 9204042.

It is an arithmetic number, because the mean of its divisors is an integer number (1760915478).

Almost surely, 2^12001221212 is an apocalyptic number.

It is an amenable number.

12001221212 is a deficient number, since it is larger than the sum of its proper divisors (9129764524).

12001221212 is a wasteful number, since it uses less digits than its factorization.

12001221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18406948 (or 18406946 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12001221212 its reverse (21212210021), we get a palindrome (33213431233).

The spelling of 12001221212 in words is "twelve billion, one million, two hundred twenty-one thousand, two hundred twelve".