12222121212 has 48 divisors (see below), whose sum is σ = 36213694720. Its totient is φ = 3492034416.

The previous prime is 12222121199. The next prime is 12222121217. The reversal of 12222121212 is 21212122221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12222121217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8082658 + ... + 8084169.

Almost surely, 2^12222121212 is an apocalyptic number.

12222121212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12222121212 is an abundant number, since it is smaller than the sum of its proper divisors (23991573508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12222121212 is a wasteful number, since it uses less digits than its factorization.

12222121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16166847 (or 16166839 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

Adding to 12222121212 its reverse (21212122221), we get a palindrome (33434243433).

The spelling of 12222121212 in words is "twelve billion, two hundred twenty-two million, one hundred twenty-one thousand, two hundred twelve".