12012121211220 has 144 divisors (see below), whose sum is σ = 39241183821840. Its totient is φ = 2956710187008.

The previous prime is 12012121211201. The next prime is 12012121211227. The reversal of 12012121211220 is 2211212121021.

12012121211220 is a `hidden beast` number, since 1 + 20 + 1 + 212 + 1 + 211 + 220 = 666.

12012121211220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 824340516624 + 11187780694596 = 907932^2 + 3344814^2 .

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 = 12012121211193 and 12012121211202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012121211227) 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, 66995932 + ... + 67174988.

It is an arithmetic number, because the mean of its divisors is an integer number (272508220985).

Almost surely, 2^{12012121211220} is an apocalyptic number.

12012121211220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12012121211220 is an abundant number, since it is smaller than the sum of its proper divisors (27229062610620).

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

12012121211220 is a wasteful number, since it uses less digits than its factorization.

12012121211220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207754 (or 207749 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 12012121211220 its reverse (2211212121021), we get a palindrome (14223333332241).

The spelling of 12012121211220 in words is "twelve trillion, twelve billion, one hundred twenty-one million, two hundred eleven thousand, two hundred twenty".