8005706221 has 4 divisors (see below), whose sum is σ = 8427059200. Its totient is φ = 7584353244.

The previous prime is 8005706179. The next prime is 8005706231. The reversal of 8005706221 is 1226075008.

8005706221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8005706221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8005706231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210676461 + ... + 210676498.

It is an arithmetic number, because the mean of its divisors is an integer number (2106764800).

Almost surely, 2^8005706221 is an apocalyptic number.

It is an amenable number.

8005706221 is a deficient number, since it is larger than the sum of its proper divisors (421352979).

8005706221 is a wasteful number, since it uses less digits than its factorization.

8005706221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421352978.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 8005706221 is about 89474.6121589806. The cubic root of 8005706221 is about 2000.4754054026.

The spelling of 8005706221 in words is "eight billion, five million, seven hundred six thousand, two hundred twenty-one".