721103 has 4 divisors (see below), whose sum is σ = 728208. Its totient is φ = 714000.

The previous prime is 721087. The next prime is 721109. The reversal of 721103 is 301127.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 721103 - 2⁴ = 721087 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 721103.

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 3 ways as a sum of consecutive naturals, for example, 3398 + ... + 3603.

It is an arithmetic number, because the mean of its divisors is an integer number (182052).

2⁷²¹¹⁰³ is an apocalyptic number.

721103 is a deficient number, since it is larger than the sum of its proper divisors (7105).

721103 is a wasteful number, since it uses less digits than its factorization.

721103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7104.

The product of its (nonzero) digits is 42, while the sum is 14.

The square root of 721103 is about 849.1778376759. The cubic root of 721103 is about 89.6738400002.

The spelling of 721103 in words is "seven hundred twenty-one thousand, one hundred three", and thus it is an iban number.