1321022222081 has 2 divisors, whose sum is σ = 1321022222082. Its totient is φ = 1321022222080.

The previous prime is 1321022222059. The next prime is 1321022222153. The reversal of 1321022222081 is 1802222201231.

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., 731683498225 + 589338723856 = 855385^2 + 767684^2 .

It is an emirp because it is prime and its reverse (1802222201231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1321022222081 - 2⁶ = 1321022222017 is a prime.

It is a super-2 number, since 2×1321022222081² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1321022222081.

It is not a weakly prime, because it can be changed into another prime (1321022222021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660511111040 + 660511111041.

It is an arithmetic number, because the mean of its divisors is an integer number (660511111041).

Almost surely, 2^{1321022222081} is an apocalyptic number.

It is an amenable number.

1321022222081 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321022222081 is an equidigital number, since it uses as much as digits as its factorization.

1321022222081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 26.

The spelling of 1321022222081 in words is "one trillion, three hundred twenty-one billion, twenty-two million, two hundred twenty-two thousand, eighty-one".