12120311302121 has 18 divisors (see below), whose sum is σ = 13447998523050. Its totient is φ = 10915487265760.

The previous prime is 12120311302081. The next prime is 12120311302193.

12120311302121 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 10822224781225 + 1298086520896 = 3289715^2 + 1139336^2 .

It is not a de Polignac number, because 12120311302121 - 2¹⁰ = 12120311301097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12120311302093 and 12120311302102.

It is not an unprimeable number, because it can be changed into a prime (12120311322121) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2989196 + ... + 5759853.

Almost surely, 2^{12120311302121} is an apocalyptic number.

12120311302121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12120311302121 is a deficient number, since it is larger than the sum of its proper divisors (1327687220929).

12120311302121 is an equidigital number, since it uses as much as digits as its factorization.

12120311302121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8749285 (or 8749167 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

It can be divided in two parts, 1212031 and 1302121, that added together give a palindrome (2514152).

The spelling of 12120311302121 in words is "twelve trillion, one hundred twenty billion, three hundred eleven million, three hundred two thousand, one hundred twenty-one".