13131021020121 has 12 divisors (see below), whose sum is σ = 18976614536880. Its totient is φ = 8749590548280.

The previous prime is 13131021020093. The next prime is 13131021020123. The reversal of 13131021020121 is 12102012013131.

13131021020121 is a `hidden beast` number, since 1 + 3 + 1 + 310 + 210 + 20 + 121 = 666.

It is not a de Polignac number, because 13131021020121 - 2¹⁹ = 13131020495833 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 13131021020094 and 13131021020103.

It is not an unprimeable number, because it can be changed into a prime (13131021020123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 368603295 + ... + 368638916.

It is an arithmetic number, because the mean of its divisors is an integer number (1581384544740).

Almost surely, 2^{13131021020121} is an apocalyptic number.

It is an amenable number.

13131021020121 is a deficient number, since it is larger than the sum of its proper divisors (5845593516759).

13131021020121 is a wasteful number, since it uses less digits than its factorization.

13131021020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737244196 (or 737244193 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

Adding to 13131021020121 its reverse (12102012013131), we get a palindrome (25233033033252).

The spelling of 13131021020121 in words is "thirteen trillion, one hundred thirty-one billion, twenty-one million, twenty thousand, one hundred twenty-one".