129468874076721 has 15 divisors (see below), whose sum is σ = 193404273511273. Its totient is φ = 86312514447180.

The previous prime is 129468874076719. The next prime is 129468874076827. The reversal of 129468874076721 is 127670478864921.

The square root of 129468874076721 is 11378439.

It is a perfect power (a square), and thus also a powerful number.

129468874076721 is a `hidden beast` number, since 1 + 2 + 9 + 4 + 68 + 87 + 407 + 67 + 21 = 666.

It is not a de Polignac number, because 129468874076721 - 2¹ = 129468874076719 is a prime.

It is a super-2 number, since 2×129468874076721² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129468874076721.

It is not an unprimeable number, because it can be changed into a prime (129468874076221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 101773816 + ... + 103038086.

Almost surely, 2^{129468874076721} is an apocalyptic number.

129468874076721 is the 11378439-th square number.

129468874076721 is the 5689220-th centered octagonal number.

It is an amenable number.

129468874076721 is a deficient number, since it is larger than the sum of its proper divisors (63935399434552).

129468874076721 is an frugal number, since it uses more digits than its factorization.

129468874076721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2528554 (or 1264274 counting only the distinct ones).

The product of its (nonzero) digits is 455196672, while the sum is 72.

The spelling of 129468874076721 in words is "one hundred twenty-nine trillion, four hundred sixty-eight billion, eight hundred seventy-four million, seventy-six thousand, seven hundred twenty-one".