12213222144 has 144 divisors (see below), whose sum is σ = 34549895520. Its totient is φ = 3816816640.

The previous prime is 12213222143. The next prime is 12213222169. The reversal of 12213222144 is 44122231221.

It is a Harshad number since it is a multiple of its sum of digits (24).

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 (12213222143) 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, 3667072 + ... + 3670400.

It is an arithmetic number, because the mean of its divisors is an integer number (239929830).

Almost surely, 2^12213222144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12213222144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17274947760).

12213222144 is an abundant number, since it is smaller than the sum of its proper divisors (22336673376).

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

12213222144 is a wasteful number, since it uses less digits than its factorization.

12213222144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3646 (or 3632 counting only the distinct ones).

The product of its digits is 1536, while the sum is 24.

Adding to 12213222144 its reverse (44122231221), we get a palindrome (56335453365).

The spelling of 12213222144 in words is "twelve billion, two hundred thirteen million, two hundred twenty-two thousand, one hundred forty-four".