1984382475221 has 2 divisors, whose sum is σ = 1984382475222. Its totient is φ = 1984382475220.

The previous prime is 1984382475191. The next prime is 1984382475289. The reversal of 1984382475221 is 1225742834891.

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., 1557828496900 + 426553978321 = 1248130^2 + 653111^2 .

It is a cyclic number.

It is not a de Polignac number, because 1984382475221 - 2¹⁰ = 1984382474197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1984382675221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992191237610 + 992191237611.

It is an arithmetic number, because the mean of its divisors is an integer number (992191237611).

Almost surely, 2^{1984382475221} is an apocalyptic number.

It is an amenable number.

1984382475221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1984382475221 is an equidigital number, since it uses as much as digits as its factorization.

1984382475221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7741440, while the sum is 56.

The spelling of 1984382475221 in words is "one trillion, nine hundred eighty-four billion, three hundred eighty-two million, four hundred seventy-five thousand, two hundred twenty-one".