721101 has 8 divisors (see below), whose sum is σ = 968224. Its totient is φ = 477360.

The previous prime is 721087. The next prime is 721109. The reversal of 721101 is 101127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 721101 - 2⁶ = 721037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 721101.

It is not an unprimeable number, because it can be changed into a prime (721109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 295 + ... + 1236.

It is an arithmetic number, because the mean of its divisors is an integer number (121028).

2⁷²¹¹⁰¹ is an apocalyptic number.

It is an amenable number.

721101 is a deficient number, since it is larger than the sum of its proper divisors (247123).

721101 is a wasteful number, since it uses less digits than its factorization.

721101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691.

The product of its (nonzero) digits is 14, while the sum is 12.

The square root of 721101 is about 849.1766600655. The cubic root of 721101 is about 89.6737570957.

Adding to 721101 its reverse (101127), we get a palindrome (822228).

The spelling of 721101 in words is "seven hundred twenty-one thousand, one hundred one", and thus it is an iban number.