12021121224 has 320 divisors, whose sum is σ = 40496163840. Its totient is φ = 3259077120.

The previous prime is 12021121219. The next prime is 12021121241. The reversal of 12021121224 is 42212112021.

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 = 12021121197 and 12021121206.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 7451842 + ... + 7453454.

It is an arithmetic number, because the mean of its divisors is an integer number (126550512).

Almost surely, 2^12021121224 is an apocalyptic number.

12021121224 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12021121224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20248081920).

12021121224 is an abundant number, since it is smaller than the sum of its proper divisors (28475042616).

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

12021121224 is a wasteful number, since it uses less digits than its factorization.

12021121224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1722 (or 1709 counting only the distinct ones).

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

Adding to 12021121224 its reverse (42212112021), we get a palindrome (54233233245).

The spelling of 12021121224 in words is "twelve billion, twenty-one million, one hundred twenty-one thousand, two hundred twenty-four".