1021212101321 has 2 divisors, whose sum is σ = 1021212101322. Its totient is φ = 1021212101320.

The previous prime is 1021212101317. The next prime is 1021212101347. The reversal of 1021212101321 is 1231012121201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1010095351225 + 11116750096 = 1005035^2 + 105436^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021212101321 - 2² = 1021212101317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1021212101321.

It is not a weakly prime, because it can be changed into another prime (1021212151321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510606050660 + 510606050661.

It is an arithmetic number, because the mean of its divisors is an integer number (510606050661).

Almost surely, 2^{1021212101321} is an apocalyptic number.

It is an amenable number.

1021212101321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021212101321 is an equidigital number, since it uses as much as digits as its factorization.

1021212101321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 1021212101321 its reverse (1231012121201), we get a palindrome (2252224222522).

The spelling of 1021212101321 in words is "one trillion, twenty-one billion, two hundred twelve million, one hundred one thousand, three hundred twenty-one".