51060721521 has 16 divisors (see below), whose sum is σ = 68224206848. Its totient is φ = 33968937600.

The previous prime is 51060721493. The next prime is 51060721529. The reversal of 51060721521 is 12512706015.

It is not a de Polignac number, because 51060721521 - 2¹⁰ = 51060720497 is a prime.

It is a super-2 number, since 2×51060721521² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51060721529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2861136 + ... + 2878926.

It is an arithmetic number, because the mean of its divisors is an integer number (4264012928).

Almost surely, 2^51060721521 is an apocalyptic number.

It is an amenable number.

51060721521 is a deficient number, since it is larger than the sum of its proper divisors (17163485327).

51060721521 is a wasteful number, since it uses less digits than its factorization.

51060721521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19752.

The product of its (nonzero) digits is 4200, while the sum is 30.

The spelling of 51060721521 in words is "fifty-one billion, sixty million, seven hundred twenty-one thousand, five hundred twenty-one".