1211231310121 has 12 divisors (see below), whose sum is σ = 1416283803732. Its totient is φ = 1032818992128.

The previous prime is 1211231310083. The next prime is 1211231310151. The reversal of 1211231310121 is 1210131321121.

It can be written as a sum of positive squares in 2 ways, for example, as 275977912896 + 935253397225 = 525336^2 + 967085^2 .

It is not a de Polignac number, because 1211231310121 - 2¹¹ = 1211231308073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211231310151) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 64029420 + ... + 64048333.

It is an arithmetic number, because the mean of its divisors is an integer number (118023650311).

Almost surely, 2^{1211231310121} is an apocalyptic number.

It is an amenable number.

1211231310121 is a deficient number, since it is larger than the sum of its proper divisors (205052493611).

1211231310121 is a wasteful number, since it uses less digits than its factorization.

1211231310121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128077960 (or 128077953 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 1211231310121 its reverse (1210131321121), we get a palindrome (2421362631242).

The spelling of 1211231310121 in words is "one trillion, two hundred eleven billion, two hundred thirty-one million, three hundred ten thousand, one hundred twenty-one".