5120205121 has 2 divisors, whose sum is σ = 5120205122. Its totient is φ = 5120205120.

The previous prime is 5120205073. The next prime is 5120205127. The reversal of 5120205121 is 1215020215.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4187513521 + 932691600 = 64711^2 + 30540^2 .

It is a cyclic number.

It is not a de Polignac number, because 5120205121 - 2¹¹ = 5120203073 is a prime.

It is a super-2 number, since 2×5120205121² = 52433000962229249282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5120205127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2560102560 + 2560102561.

It is an arithmetic number, because the mean of its divisors is an integer number (2560102561).

Almost surely, 2^5120205121 is an apocalyptic number.

It is an amenable number.

5120205121 is a deficient number, since it is larger than the sum of its proper divisors (1).

5120205121 is an equidigital number, since it uses as much as digits as its factorization.

5120205121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 5120205121 is about 71555.6085921991. The cubic root of 5120205121 is about 1723.5707683743.

Adding to 5120205121 its reverse (1215020215), we get a palindrome (6335225336).

The spelling of 5120205121 in words is "five billion, one hundred twenty million, two hundred five thousand, one hundred twenty-one".