8450071921 has 2 divisors, whose sum is σ = 8450071922. Its totient is φ = 8450071920.

The previous prime is 8450071841. The next prime is 8450071961. The reversal of 8450071921 is 1291700548.

8450071921 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6829204321 + 1620867600 = 82639^2 + 40260^2 .

It is a cyclic number.

It is not a de Polignac number, because 8450071921 - 2⁷ = 8450071793 is a prime.

It is not a weakly prime, because it can be changed into another prime (8450071961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4225035960 + 4225035961.

It is an arithmetic number, because the mean of its divisors is an integer number (4225035961).

Almost surely, 2^8450071921 is an apocalyptic number.

It is an amenable number.

8450071921 is a deficient number, since it is larger than the sum of its proper divisors (1).

8450071921 is an equidigital number, since it uses as much as digits as its factorization.

8450071921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 37.

The square root of 8450071921 is about 91924.2727520865. The cubic root of 8450071921 is about 2036.8238349298.

The spelling of 8450071921 in words is "eight billion, four hundred fifty million, seventy-one thousand, nine hundred twenty-one".