5121720510723 has 8 divisors (see below), whose sum is σ = 7587734090000. Its totient is φ = 3414480340464.

The previous prime is 5121720510719. The next prime is 5121720510761. The reversal of 5121720510723 is 3270150271215.

5121720510723 is a `hidden beast` number, since 5 + 1 + 2 + 1 + 72 + 0 + 510 + 72 + 3 = 666.

It is not a de Polignac number, because 5121720510723 - 2² = 5121720510719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5121720530723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 94846676098 + ... + 94846676151.

It is an arithmetic number, because the mean of its divisors is an integer number (948466761250).

Almost surely, 2^{5121720510723} is an apocalyptic number.

5121720510723 is a deficient number, since it is larger than the sum of its proper divisors (2466013579277).

5121720510723 is a wasteful number, since it uses less digits than its factorization.

5121720510723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189693352258 (or 189693352252 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 36.

Adding to 5121720510723 its reverse (3270150271215), we get a palindrome (8391870781938).

The spelling of 5121720510723 in words is "five trillion, one hundred twenty-one billion, seven hundred twenty million, five hundred ten thousand, seven hundred twenty-three".