8120376221 has 2 divisors, whose sum is σ = 8120376222. Its totient is φ = 8120376220.

The previous prime is 8120376157. The next prime is 8120376223. The reversal of 8120376221 is 1226730218.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6766872121 + 1353504100 = 82261^2 + 36790^2 .

It is a cyclic number.

It is not a de Polignac number, because 8120376221 - 2⁶ = 8120376157 is a prime.

Together with 8120376223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8120376223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4060188110 + 4060188111.

It is an arithmetic number, because the mean of its divisors is an integer number (4060188111).

Almost surely, 2^8120376221 is an apocalyptic number.

It is an amenable number.

8120376221 is a deficient number, since it is larger than the sum of its proper divisors (1).

8120376221 is an equidigital number, since it uses as much as digits as its factorization.

8120376221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 8120376221 is about 90113.1301254151. The cubic root of 8120376221 is about 2009.9814541658.

The spelling of 8120376221 in words is "eight billion, one hundred twenty million, three hundred seventy-six thousand, two hundred twenty-one".