107828722851721 has 3 divisors (see below), whose sum is σ = 107828733235783. Its totient is φ = 107828712467660.

The previous prime is 107828722851677. The next prime is 107828722851743. The reversal of 107828722851721 is 127158227828701.

It is a happy number.

The square root of 107828722851721 is 10384061.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 103486083641721 + 4342639210000 = 10172811^2 + 2083900^2 .

It is not a de Polignac number, because 107828722851721 - 2¹⁵ = 107828722818953 is a prime.

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 107828722851721.

It is not an unprimeable number, because it can be changed into a prime (107828722831721) 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 2 ways as a sum of consecutive naturals, for example, 5192031 + ... + 15576091.

Almost surely, 2^{107828722851721} is an apocalyptic number.

107828722851721 is the 10384061-st square number.

107828722851721 is the 5192031-st centered octagonal number.

It is an amenable number.

107828722851721 is a deficient number, since it is larger than the sum of its proper divisors (10384062).

107828722851721 is an frugal number, since it uses more digits than its factorization.

107828722851721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20768122 (or 10384061 counting only the distinct ones).

The product of its (nonzero) digits is 14049280, while the sum is 61.

The spelling of 107828722851721 in words is "one hundred seven trillion, eight hundred twenty-eight billion, seven hundred twenty-two million, eight hundred fifty-one thousand, seven hundred twenty-one".