12221111212 has 24 divisors (see below), whose sum is σ = 22541878800. Its totient is φ = 5788526016.

The previous prime is 12221111207. The next prime is 12221111213. The reversal of 12221111212 is 21211112221.

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

It is not an unprimeable number, because it can be changed into a prime (12221111213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 987762 + ... + 1000057.

It is an arithmetic number, because the mean of its divisors is an integer number (939244950).

Almost surely, 2^12221111212 is an apocalyptic number.

It is an amenable number.

12221111212 is a deficient number, since it is larger than the sum of its proper divisors (10320767588).

12221111212 is a wasteful number, since it uses less digits than its factorization.

12221111212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1987905 (or 1987903 counting only the distinct ones).

The product of its digits is 32, while the sum is 16.

Adding to 12221111212 its reverse (21211112221), we get a palindrome (33432223433).

The spelling of 12221111212 in words is "twelve billion, two hundred twenty-one million, one hundred eleven thousand, two hundred twelve".