2121023131321 has 2 divisors, whose sum is σ = 2121023131322. Its totient is φ = 2121023131320.

The previous prime is 2121023131307. The next prime is 2121023131351. The reversal of 2121023131321 is 1231313201212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1985672721321 + 135350410000 = 1409139^2 + 367900^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121023131321 - 2¹¹ = 2121023129273 is a prime.

It is a super-2 number, since 2×2121023131321² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2121023131292 and 2121023131301.

It is not a weakly prime, because it can be changed into another prime (2121023131351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060511565660 + 1060511565661.

It is an arithmetic number, because the mean of its divisors is an integer number (1060511565661).

Almost surely, 2^{2121023131321} is an apocalyptic number.

It is an amenable number.

2121023131321 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121023131321 is an equidigital number, since it uses as much as digits as its factorization.

2121023131321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 2121023131321 its reverse (1231313201212), we get a palindrome (3352336332533).

The spelling of 2121023131321 in words is "two trillion, one hundred twenty-one billion, twenty-three million, one hundred thirty-one thousand, three hundred twenty-one".