8121508211 has 2 divisors, whose sum is σ = 8121508212. Its totient is φ = 8121508210.

The previous prime is 8121508207. The next prime is 8121508259. The reversal of 8121508211 is 1128051218.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8121508211 - 2² = 8121508207 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (8121508111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4060754105 + 4060754106.

It is an arithmetic number, because the mean of its divisors is an integer number (4060754106).

Almost surely, 2^8121508211 is an apocalyptic number.

8121508211 is a deficient number, since it is larger than the sum of its proper divisors (1).

8121508211 is an equidigital number, since it uses as much as digits as its factorization.

8121508211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1280, while the sum is 29.

The square root of 8121508211 is about 90119.4108447231. The cubic root of 8121508211 is about 2010.0748477528.

Adding to 8121508211 its reverse (1128051218), we get a palindrome (9249559429).

The spelling of 8121508211 in words is "eight billion, one hundred twenty-one million, five hundred eight thousand, two hundred eleven".