8471801085221 has 2 divisors, whose sum is σ = 8471801085222. Its totient is φ = 8471801085220.

The previous prime is 8471801085169. The next prime is 8471801085317. The reversal of 8471801085221 is 1225801081748.

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., 7750127049025 + 721674036196 = 2783905^2 + 849514^2 .

It is a cyclic number.

It is not a de Polignac number, because 8471801085221 - 2⁴² = 4073754574117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8471801081221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4235900542610 + 4235900542611.

It is an arithmetic number, because the mean of its divisors is an integer number (4235900542611).

Almost surely, 2^{8471801085221} is an apocalyptic number.

It is an amenable number.

8471801085221 is a deficient number, since it is larger than the sum of its proper divisors (1).

8471801085221 is an equidigital number, since it uses as much as digits as its factorization.

8471801085221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 286720, while the sum is 47.

The spelling of 8471801085221 in words is "eight trillion, four hundred seventy-one billion, eight hundred one million, eighty-five thousand, two hundred twenty-one".