5105512121 has 2 divisors, whose sum is σ = 5105512122. Its totient is φ = 5105512120.

The previous prime is 5105512073. The next prime is 5105512123. The reversal of 5105512121 is 1212155015.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5088824896 + 16687225 = 71336^2 + 4085^2 .

It is a cyclic number.

It is not a de Polignac number, because 5105512121 - 2²² = 5101317817 is a prime.

Together with 5105512123, 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 (5105512123) 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, 2552756060 + 2552756061.

It is an arithmetic number, because the mean of its divisors is an integer number (2552756061).

Almost surely, 2^5105512121 is an apocalyptic number.

It is an amenable number.

5105512121 is a deficient number, since it is larger than the sum of its proper divisors (1).

5105512121 is an equidigital number, since it uses as much as digits as its factorization.

5105512121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 500, while the sum is 23.

The square root of 5105512121 is about 71452.8664295562. The cubic root of 5105512121 is about 1721.9205292955.

Adding to 5105512121 its reverse (1212155015), we get a palindrome (6317667136).

The spelling of 5105512121 in words is "five billion, one hundred five million, five hundred twelve thousand, one hundred twenty-one".