12211221222 has 48 divisors (see below), whose sum is σ = 28049304192. Its totient is φ = 3832634880.

The previous prime is 12211221181. The next prime is 12211221223. The reversal of 12211221222 is 22212211221.

It is a happy number.

12211221222 is a `hidden beast` number, since 1 + 221 + 1 + 221 + 222 = 666.

It is a super-2 number, since 2×12211221222² (a number of 21 digits) contains 22 as substring.

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 junction number, because it is equal to n+sod(n) for n = 12211221195 and 12211221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211221223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 275083 + ... + 316374.

It is an arithmetic number, because the mean of its divisors is an integer number (584360504).

Almost surely, 2^12211221222 is an apocalyptic number.

12211221222 is an abundant number, since it is smaller than the sum of its proper divisors (15838082970).

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

12211221222 is a wasteful number, since it uses less digits than its factorization.

12211221222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591533 (or 591530 counting only the distinct ones).

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

Adding to 12211221222 its reverse (22212211221), we get a palindrome (34423432443).

The spelling of 12211221222 in words is "twelve billion, two hundred eleven million, two hundred twenty-one thousand, two hundred twenty-two".