1313122021121 has 4 divisors (see below), whose sum is σ = 1313180999172. Its totient is φ = 1313063043072.

The previous prime is 1313122021111. The next prime is 1313122021139. The reversal of 1313122021121 is 1211202213131.

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 475494372721 + 837627648400 = 689561^2 + 915220^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313122021121 - 2³⁸ = 1038244114177 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1313122021093 and 1313122021102.

It is not an unprimeable number, because it can be changed into a prime (1313122021111) 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, 29455616 + ... + 29500161.

It is an arithmetic number, because the mean of its divisors is an integer number (328295249793).

Almost surely, 2^{1313122021121} is an apocalyptic number.

It is an amenable number.

1313122021121 is a deficient number, since it is larger than the sum of its proper divisors (58978051).

1313122021121 is an equidigital number, since it uses as much as digits as its factorization.

1313122021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58978050.

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

Adding to 1313122021121 its reverse (1211202213131), we get a palindrome (2524324234252).

The spelling of 1313122021121 in words is "one trillion, three hundred thirteen billion, one hundred twenty-two million, twenty-one thousand, one hundred twenty-one".