8522025221 has 2 divisors, whose sum is σ = 8522025222. Its totient is φ = 8522025220.

The previous prime is 8522025181. The next prime is 8522025241. The reversal of 8522025221 is 1225202258.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8192784196 + 329241025 = 90514^2 + 18145^2 .

It is a cyclic number.

It is not a de Polignac number, because 8522025221 - 2¹⁴ = 8522008837 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8522025241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4261012610 + 4261012611.

It is an arithmetic number, because the mean of its divisors is an integer number (4261012611).

Almost surely, 2^8522025221 is an apocalyptic number.

It is an amenable number.

8522025221 is a deficient number, since it is larger than the sum of its proper divisors (1).

8522025221 is an equidigital number, since it uses as much as digits as its factorization.

8522025221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 8522025221 is about 92314.8158260634. The cubic root of 8522025221 is about 2042.5887630785.

Adding to 8522025221 its reverse (1225202258), we get a palindrome (9747227479).

The spelling of 8522025221 in words is "eight billion, five hundred twenty-two million, twenty-five thousand, two hundred twenty-one".