12012211221210 has 144 divisors (see below), whose sum is σ = 32382760560696. Its totient is φ = 3089096994816.

The previous prime is 12012211221193. The next prime is 12012211221217. The reversal of 12012211221210 is 1212211221021.

12012211221210 is a `hidden beast` number, since 1 + 20 + 1 + 2 + 211 + 221 + 210 = 666.

It can be written as a sum of positive squares in 12 ways, for example, as 2439678430809 + 9572532790401 = 1561947^2 + 3093951^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (12012211221217) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 13491342 + ... + 14354118.

Almost surely, 2^{12012211221210} is an apocalyptic number.

12012211221210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12012211221210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16191380280348).

12012211221210 is an abundant number, since it is smaller than the sum of its proper divisors (20370549339486).

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

12012211221210 is a wasteful number, since it uses less digits than its factorization.

12012211221210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862977 (or 862937 counting only the distinct ones).

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

Adding to 12012211221210 its reverse (1212211221021), we get a palindrome (13224422442231).

The spelling of 12012211221210 in words is "twelve trillion, twelve billion, two hundred eleven million, two hundred twenty-one thousand, two hundred ten".