827130221 has 2 divisors, whose sum is σ = 827130222. Its totient is φ = 827130220.

The previous prime is 827130217. The next prime is 827130323. The reversal of 827130221 is 122031728.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 631969321 + 195160900 = 25139^2 + 13970^2 .

It is a cyclic number.

It is not a de Polignac number, because 827130221 - 2² = 827130217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (827139221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 413565110 + 413565111.

It is an arithmetic number, because the mean of its divisors is an integer number (413565111).

Almost surely, 2^827130221 is an apocalyptic number.

It is an amenable number.

827130221 is a deficient number, since it is larger than the sum of its proper divisors (1).

827130221 is an equidigital number, since it uses as much as digits as its factorization.

827130221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 827130221 is about 28759.8717139003. The cubic root of 827130221 is about 938.6952703638.

Adding to 827130221 its reverse (122031728), we get a palindrome (949161949).

The spelling of 827130221 in words is "eight hundred twenty-seven million, one hundred thirty thousand, two hundred twenty-one".