2121313131321 has 32 divisors (see below), whose sum is σ = 2967085099008. Its totient is φ = 1346520692160.

The previous prime is 2121313131313. The next prime is 2121313131337. The reversal of 2121313131321 is 1231313131212.

It is not a de Polignac number, because 2121313131321 - 2³ = 2121313131313 is a prime.

It is a super-2 number, since 2×2121313131321² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2121313131291 and 2121313131300.

It is not an unprimeable number, because it can be changed into a prime (2121313131521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43229626 + ... + 43278668.

It is an arithmetic number, because the mean of its divisors is an integer number (92721409344).

Almost surely, 2^{2121313131321} is an apocalyptic number.

It is an amenable number.

2121313131321 is a deficient number, since it is larger than the sum of its proper divisors (845771967687).

2121313131321 is a wasteful number, since it uses less digits than its factorization.

2121313131321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57421.

The product of its digits is 648, while the sum is 24.

Adding to 2121313131321 its reverse (1231313131212), we get a palindrome (3352626262533).

The spelling of 2121313131321 in words is "two trillion, one hundred twenty-one billion, three hundred thirteen million, one hundred thirty-one thousand, three hundred twenty-one".