108125711721 has 24 divisors (see below), whose sum is σ = 164314989384. Its totient is φ = 68424963840.

The previous prime is 108125711719. The next prime is 108125711737. The reversal of 108125711721 is 127117521801.

108125711721 is a `hidden beast` number, since 1 + 0 + 8 + 12 + 571 + 1 + 72 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 47000072025 + 61125639696 = 216795^2 + 247236^2 .

It is not a de Polignac number, because 108125711721 - 2¹ = 108125711719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (108125711741) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3946126 + ... + 3973431.

It is an arithmetic number, because the mean of its divisors is an integer number (6846457891).

Almost surely, 2^108125711721 is an apocalyptic number.

It is an amenable number.

108125711721 is a deficient number, since it is larger than the sum of its proper divisors (56189277663).

108125711721 is a wasteful number, since it uses less digits than its factorization.

108125711721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7919641 (or 7919638 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 36.

The spelling of 108125711721 in words is "one hundred eight billion, one hundred twenty-five million, seven hundred eleven thousand, seven hundred twenty-one".