8212770521 has 2 divisors, whose sum is σ = 8212770522. Its totient is φ = 8212770520.

The previous prime is 8212770487. The next prime is 8212770523. The reversal of 8212770521 is 1250772128.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6085716121 + 2127054400 = 78011^2 + 46120^2 .

It is a cyclic number.

It is not a de Polignac number, because 8212770521 - 2⁶ = 8212770457 is a prime.

It is a super-2 number, since 2×8212770521² (a number of 21 digits) contains 22 as substring.

Together with 8212770523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (8212770523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4106385260 + 4106385261.

It is an arithmetic number, because the mean of its divisors is an integer number (4106385261).

Almost surely, 2^8212770521 is an apocalyptic number.

It is an amenable number.

8212770521 is a deficient number, since it is larger than the sum of its proper divisors (1).

8212770521 is an equidigital number, since it uses as much as digits as its factorization.

8212770521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15680, while the sum is 35.

The square root of 8212770521 is about 90624.3373548188. The cubic root of 8212770521 is about 2017.5759669862.

The spelling of 8212770521 in words is "eight billion, two hundred twelve million, seven hundred seventy thousand, five hundred twenty-one".