8194250221 has 2 divisors, whose sum is σ = 8194250222. Its totient is φ = 8194250220.

The previous prime is 8194250191. The next prime is 8194250249. The reversal of 8194250221 is 1220524918.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7087956100 + 1106294121 = 84190^2 + 33261^2 .

It is a cyclic number.

It is not a de Polignac number, because 8194250221 - 2⁷ = 8194250093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8194250261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4097125110 + 4097125111.

It is an arithmetic number, because the mean of its divisors is an integer number (4097125111).

Almost surely, 2^8194250221 is an apocalyptic number.

It is an amenable number.

8194250221 is a deficient number, since it is larger than the sum of its proper divisors (1).

8194250221 is an equidigital number, since it uses as much as digits as its factorization.

8194250221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 8194250221 is about 90522.0979706061. The cubic root of 8194250221 is about 2016.0582398095.

The spelling of 8194250221 in words is "eight billion, one hundred ninety-four million, two hundred fifty thousand, two hundred twenty-one".