10721276516557 has 4 divisors (see below), whose sum is σ = 10729672192476. Its totient is φ = 10712880840640.

The previous prime is 10721276516527. The next prime is 10721276516563. The reversal of 10721276516557 is 75561567212701.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9505172638116 + 1216103878441 = 3083046^2 + 1102771^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10721276516557 is a prime.

It is a super-2 number, since 2×10721276516557² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10721276516498 and 10721276516507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10721276516527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4197836044 + ... + 4197838597.

It is an arithmetic number, because the mean of its divisors is an integer number (2682418048119).

Almost surely, 2^{10721276516557} is an apocalyptic number.

It is an amenable number.

10721276516557 is a deficient number, since it is larger than the sum of its proper divisors (8395675919).

10721276516557 is an equidigital number, since it uses as much as digits as its factorization.

10721276516557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8395675918.

The product of its (nonzero) digits is 6174000, while the sum is 55.

The spelling of 10721276516557 in words is "ten trillion, seven hundred twenty-one billion, two hundred seventy-six million, five hundred sixteen thousand, five hundred fifty-seven".