10721011697128 has 8 divisors (see below), whose sum is σ = 20101896932130. Its totient is φ = 5360505848560.

The previous prime is 10721011697087. The next prime is 10721011697129. The reversal of 10721011697128 is 82179611012701.

It can be written as a sum of positive squares in only one way, i.e., 9166107443364 + 1554904253764 = 3027558^2 + 1246958^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×10721011697128² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (10721011697129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670063231063 + ... + 670063231078.

Almost surely, 2^{10721011697128} is an apocalyptic number.

It is an amenable number.

10721011697128 is a deficient number, since it is larger than the sum of its proper divisors (9380885235002).

10721011697128 is a wasteful number, since it uses less digits than its factorization.

10721011697128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340126462147 (or 1340126462143 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 46.

The spelling of 10721011697128 in words is "ten trillion, seven hundred twenty-one billion, eleven million, six hundred ninety-seven thousand, one hundred twenty-eight".