2127126121 has 2 divisors, whose sum is σ = 2127126122. Its totient is φ = 2127126120.

The previous prime is 2127126119. The next prime is 2127126143. The reversal of 2127126121 is 1216217212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2123366400 + 3759721 = 46080^2 + 1939^2 .

It is a cyclic number.

It is not a de Polignac number, because 2127126121 - 2¹ = 2127126119 is a prime.

Together with 2127126119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2127123121) 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, 1063563060 + 1063563061.

It is an arithmetic number, because the mean of its divisors is an integer number (1063563061).

Almost surely, 2^2127126121 is an apocalyptic number.

It is an amenable number.

2127126121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2127126121 is an equidigital number, since it uses as much as digits as its factorization.

2127126121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 672, while the sum is 25.

The square root of 2127126121 is about 46120.7775411473. Note that the first 3 decimals coincide. The cubic root of 2127126121 is about 1286.0694254117.

The spelling of 2127126121 in words is "two billion, one hundred twenty-seven million, one hundred twenty-six thousand, one hundred twenty-one".