8571713225021 has 2 divisors, whose sum is σ = 8571713225022. Its totient is φ = 8571713225020.

The previous prime is 8571713225011. The next prime is 8571713225167. The reversal of 8571713225021 is 1205223171758.

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., 8108341675225 + 463371549796 = 2847515^2 + 680714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8571713225021 is a prime.

It is a super-2 number, since 2×8571713225021² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8571713225011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4285856612510 + 4285856612511.

It is an arithmetic number, because the mean of its divisors is an integer number (4285856612511).

Almost surely, 2^{8571713225021} is an apocalyptic number.

It is an amenable number.

8571713225021 is a deficient number, since it is larger than the sum of its proper divisors (1).

8571713225021 is an equidigital number, since it uses as much as digits as its factorization.

8571713225021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 235200, while the sum is 44.

Adding to 8571713225021 its reverse (1205223171758), we get a palindrome (9776936396779).

The spelling of 8571713225021 in words is "eight trillion, five hundred seventy-one billion, seven hundred thirteen million, two hundred twenty-five thousand, twenty-one".