12121221211012 has 12 divisors (see below), whose sum is σ = 21729506317596. Its totient is φ = 5912790834560.

The previous prime is 12121221210991. The next prime is 12121221211013. The reversal of 12121221211012 is 21011212212121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 4425612593796 + 7695608617216 = 2103714^2 + 2774096^2 .

It is not an unprimeable number, because it can be changed into a prime (12121221211013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36954942553 + ... + 36954942880.

It is an arithmetic number, because the mean of its divisors is an integer number (1810792193133).

Almost surely, 2^{12121221211012} is an apocalyptic number.

It is an amenable number.

12121221211012 is a deficient number, since it is larger than the sum of its proper divisors (9608285106584).

12121221211012 is a wasteful number, since it uses less digits than its factorization.

12121221211012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73909885478 (or 73909885476 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 12121221211012 its reverse (21011212212121), we get a palindrome (33132433423133).

The spelling of 12121221211012 in words is "twelve trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred eleven thousand, twelve".