1331131201121 has 4 divisors (see below), whose sum is σ = 1331137594644. Its totient is φ = 1331124807600.

The previous prime is 1331131201117. The next prime is 1331131201139. The reversal of 1331131201121 is 1211021311331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 810765180625 + 520366020496 = 900425^2 + 721364^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331131201121 - 2² = 1331131201117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1331131201093 and 1331131201102.

It is not an unprimeable number, because it can be changed into a prime (1331131201721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2873570 + ... + 3304491.

It is an arithmetic number, because the mean of its divisors is an integer number (332784398661).

Almost surely, 2^{1331131201121} is an apocalyptic number.

It is an amenable number.

1331131201121 is a deficient number, since it is larger than the sum of its proper divisors (6393523).

1331131201121 is an equidigital number, since it uses as much as digits as its factorization.

1331131201121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6393522.

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 1331131201121 its reverse (1211021311331), we get a palindrome (2542152512452).

The spelling of 1331131201121 in words is "one trillion, three hundred thirty-one billion, one hundred thirty-one million, two hundred one thousand, one hundred twenty-one".