1821885376273 has 2 divisors, whose sum is σ = 1821885376274. Its totient is φ = 1821885376272.

The previous prime is 1821885376261. The next prime is 1821885376277. The reversal of 1821885376273 is 3726735881281.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1820618585809 + 1266790464 = 1349303^2 + 35592^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1821885376273 is a prime.

It is not a weakly prime, because it can be changed into another prime (1821885376277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910942688136 + 910942688137.

It is an arithmetic number, because the mean of its divisors is an integer number (910942688137).

Almost surely, 2^{1821885376273} is an apocalyptic number.

It is an amenable number.

1821885376273 is a deficient number, since it is larger than the sum of its proper divisors (1).

1821885376273 is an equidigital number, since it uses as much as digits as its factorization.

1821885376273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27095040, while the sum is 61.

The spelling of 1821885376273 in words is "one trillion, eight hundred twenty-one billion, eight hundred eighty-five million, three hundred seventy-six thousand, two hundred seventy-three".