5121516535621 has 2 divisors, whose sum is σ = 5121516535622. Its totient is φ = 5121516535620.

The previous prime is 5121516535607. The next prime is 5121516535643. The reversal of 5121516535621 is 1265356151215.

It is a happy number.

5121516535621 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3937585392225 + 1183931143396 = 1984335^2 + 1088086^2 .

It is a cyclic number.

It is not a de Polignac number, because 5121516535621 - 2¹⁹ = 5121516011333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5121516535921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2560758267810 + 2560758267811.

It is an arithmetic number, because the mean of its divisors is an integer number (2560758267811).

Almost surely, 2^{5121516535621} is an apocalyptic number.

It is an amenable number.

5121516535621 is a deficient number, since it is larger than the sum of its proper divisors (1).

5121516535621 is an equidigital number, since it uses as much as digits as its factorization.

5121516535621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 270000, while the sum is 43.

The spelling of 5121516535621 in words is "five trillion, one hundred twenty-one billion, five hundred sixteen million, five hundred thirty-five thousand, six hundred twenty-one".