1021312222193 has 2 divisors, whose sum is σ = 1021312222194. Its totient is φ = 1021312222192.

The previous prime is 1021312222171. The next prime is 1021312222253. The reversal of 1021312222193 is 3912222131201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 777338462224 + 243973759969 = 881668^2 + 493937^2 .

It is an emirp because it is prime and its reverse (3912222131201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021312222193 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021312222123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510656111096 + 510656111097.

It is an arithmetic number, because the mean of its divisors is an integer number (510656111097).

Almost surely, 2^{1021312222193} is an apocalyptic number.

It is an amenable number.

1021312222193 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021312222193 is an equidigital number, since it uses as much as digits as its factorization.

1021312222193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 29.

Adding to 1021312222193 its reverse (3912222131201), we get a palindrome (4933534353394).

The spelling of 1021312222193 in words is "one trillion, twenty-one billion, three hundred twelve million, two hundred twenty-two thousand, one hundred ninety-three".