5121726266521 has 2 divisors, whose sum is σ = 5121726266522. Its totient is φ = 5121726266520.

The previous prime is 5121726266477. The next prime is 5121726266533. The reversal of 5121726266521 is 1256626271215.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3796087206025 + 1325639060496 = 1948355^2 + 1151364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5121726266521 is a prime.

It is a super-2 number, since 2×5121726266521² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5121726266021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2560863133260 + 2560863133261.

It is an arithmetic number, because the mean of its divisors is an integer number (2560863133261).

Almost surely, 2^{5121726266521} is an apocalyptic number.

It is an amenable number.

5121726266521 is a deficient number, since it is larger than the sum of its proper divisors (1).

5121726266521 is an equidigital number, since it uses as much as digits as its factorization.

5121726266521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 604800, while the sum is 46.

The spelling of 5121726266521 in words is "five trillion, one hundred twenty-one billion, seven hundred twenty-six million, two hundred sixty-six thousand, five hundred twenty-one".