12012001220 has 24 divisors (see below), whose sum is σ = 25231285464. Its totient is φ = 4803641856.

The previous prime is 12012001193. The next prime is 12012001237. The reversal of 12012001220 is 2210021021.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2282546176 + 9729455044 = 47776^2 + 98638^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15182 + ... + 155738.

It is an arithmetic number, because the mean of its divisors is an integer number (1051303561).

Almost surely, 2^12012001220 is an apocalyptic number.

12012001220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12012001220 is an abundant number, since it is smaller than the sum of its proper divisors (13219284244).

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

12012001220 is a wasteful number, since it uses less digits than its factorization.

12012001220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144839 (or 144837 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 12012001220 its reverse (2210021021), we get a palindrome (14222022241).

The spelling of 12012001220 in words is "twelve billion, twelve million, one thousand, two hundred twenty".