11721103 has 4 divisors (see below), whose sum is σ = 11773888. Its totient is φ = 11668320.

The previous prime is 11721079. The next prime is 11721107. The reversal of 11721103 is 30112711.

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 11721103 - 2⁹ = 11720591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11721107) 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, 26058 + ... + 26503.

It is an arithmetic number, because the mean of its divisors is an integer number (2943472).

Almost surely, 2^11721103 is an apocalyptic number.

11721103 is a deficient number, since it is larger than the sum of its proper divisors (52785).

11721103 is an equidigital number, since it uses as much as digits as its factorization.

11721103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52784.

The product of its (nonzero) digits is 42, while the sum is 16.

The square root of 11721103 is about 3423.6096448047. The cubic root of 11721103 is about 227.1552755213.

Adding to 11721103 its reverse (30112711), we get a palindrome (41833814).

The spelling of 11721103 in words is "eleven million, seven hundred twenty-one thousand, one hundred three".