107721 has 6 divisors (see below), whose sum is σ = 155610. Its totient is φ = 71808.

The previous prime is 107719. The next prime is 107741. The reversal of 107721 is 127701.

It can be written as a sum of positive squares in only one way, i.e., 69696 + 38025 = 264^2 + 195^2 .

It is not a de Polignac number, because 107721 - 2¹ = 107719 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 107694 and 107703.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 107721.

It is not an unprimeable number, because it can be changed into a prime (107741) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5976 + ... + 5993.

It is an arithmetic number, because the mean of its divisors is an integer number (25935).

2¹⁰⁷⁷²¹ is an apocalyptic number.

It is an amenable number.

107721 is a deficient number, since it is larger than the sum of its proper divisors (47889).

107721 is a wasteful number, since it uses less digits than its factorization.

107721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11975 (or 11972 counting only the distinct ones).

The product of its (nonzero) digits is 98, while the sum is 18.

The square root of 107721 is about 328.2087750198. The cubic root of 107721 is about 47.5809883354.

It can be divided in two parts, 107 and 721, that added together give a palindrome (828).

The spelling of 107721 in words is "one hundred seven thousand, seven hundred twenty-one", and thus it is an iban number.