1313221210121 has 4 divisors (see below), whose sum is σ = 1315435749012. Its totient is φ = 1311006671232.

The previous prime is 1313221210043. The next prime is 1313221210129. The reversal of 1313221210121 is 1210121223131.

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 394460619721 + 918760590400 = 628061^2 + 958520^2 .

It is a cyclic number.

It is not a de Polignac number, because 1313221210121 - 2³⁸ = 1038343303177 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1313221210093 and 1313221210102.

It is not an unprimeable number, because it can be changed into a prime (1313221210129) 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, 1107268556 + ... + 1107269741.

It is an arithmetic number, because the mean of its divisors is an integer number (328858937253).

Almost surely, 2^{1313221210121} is an apocalyptic number.

It is an amenable number.

1313221210121 is a deficient number, since it is larger than the sum of its proper divisors (2214538891).

1313221210121 is an equidigital number, since it uses as much as digits as its factorization.

1313221210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2214538890.

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

Adding to 1313221210121 its reverse (1210121223131), we get a palindrome (2523342433252).

The spelling of 1313221210121 in words is "one trillion, three hundred thirteen billion, two hundred twenty-one million, two hundred ten thousand, one hundred twenty-one".