12131220222 has 96 divisors (see below), whose sum is σ = 29129877504. Its totient is φ = 3618086400.

The previous prime is 12131220221. The next prime is 12131220251. The reversal of 12131220222 is 22202213121.

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

It is a junction number, because it is equal to n+sod(n) for n = 12131220195 and 12131220204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12131220221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3666693 + ... + 3669999.

It is an arithmetic number, because the mean of its divisors is an integer number (303436224).

Almost surely, 2^12131220222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12131220222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14564938752).

12131220222 is an abundant number, since it is smaller than the sum of its proper divisors (16998657282).

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

12131220222 is a wasteful number, since it uses less digits than its factorization.

12131220222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3614 (or 3611 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 12131220222 its reverse (22202213121), we get a palindrome (34333433343).

The spelling of 12131220222 in words is "twelve billion, one hundred thirty-one million, two hundred twenty thousand, two hundred twenty-two".