12121224144 has 40 divisors (see below), whose sum is σ = 31488118560. Its totient is φ = 4017833088.

The previous prime is 12121224127. The next prime is 12121224169. The reversal of 12121224144 is 44142212121.

It is a happy number.

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 a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 696787 + ... + 713970.

It is an arithmetic number, because the mean of its divisors is an integer number (787202964).

Almost surely, 2^12121224144 is an apocalyptic number.

It is an amenable number.

12121224144 is an abundant number, since it is smaller than the sum of its proper divisors (19366894416).

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

12121224144 is a wasteful number, since it uses less digits than its factorization.

12121224144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1410947 (or 1410941 counting only the distinct ones).

The product of its digits is 1024, while the sum is 24.

Adding to 12121224144 its reverse (44142212121), we get a palindrome (56263436265).

The spelling of 12121224144 in words is "twelve billion, one hundred twenty-one million, two hundred twenty-four thousand, one hundred forty-four".