1331031213121 has 16 divisors (see below), whose sum is σ = 1426920909120. Its totient is φ = 1237131118080.

The previous prime is 1331031213067. The next prime is 1331031213173. The reversal of 1331031213121 is 1213121301331.

It is a cyclic number.

It is not a de Polignac number, because 1331031213121 - 2³⁵ = 1296671474753 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1331031213092 and 1331031213101.

It is not an unprimeable number, because it can be changed into a prime (1331031213191) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 684670 + ... + 1769416.

It is an arithmetic number, because the mean of its divisors is an integer number (89182556820).

Almost surely, 2^{1331031213121} is an apocalyptic number.

It is an amenable number.

1331031213121 is a deficient number, since it is larger than the sum of its proper divisors (95889695999).

1331031213121 is a wasteful number, since it uses less digits than its factorization.

1331031213121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085664.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 1331031213121 its reverse (1213121301331), we get a palindrome (2544152514452).

The spelling of 1331031213121 in words is "one trillion, three hundred thirty-one billion, thirty-one million, two hundred thirteen thousand, one hundred twenty-one".