12222211212 has 18 divisors (see below), whose sum is σ = 30895033988. Its totient is φ = 4074070392.

The previous prime is 12222211189. The next prime is 12222211237. The reversal of 12222211212 is 21211222221.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (18).

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 an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 169752898 + ... + 169752969.

Almost surely, 2^12222211212 is an apocalyptic number.

12222211212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12222211212 is an abundant number, since it is smaller than the sum of its proper divisors (18672822776).

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

12222211212 is a wasteful number, since it uses less digits than its factorization.

12222211212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339505877 (or 339505872 counting only the distinct ones).

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

Adding to 12222211212 its reverse (21211222221), we get a palindrome (33433433433).

The spelling of 12222211212 in words is "twelve billion, two hundred twenty-two million, two hundred eleven thousand, two hundred twelve".