11721071 has 4 divisors (see below), whose sum is σ = 11736072. Its totient is φ = 11706072.

The previous prime is 11721049. The next prime is 11721077. The reversal of 11721071 is 17012711.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17012711 = 37 ⋅459803.

It is a cyclic number.

It is not a de Polignac number, because 11721071 - 2¹⁰ = 11720047 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 (11721077) 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, 6260 + ... + 7913.

It is an arithmetic number, because the mean of its divisors is an integer number (2934018).

Almost surely, 2^11721071 is an apocalyptic number.

11721071 is a deficient number, since it is larger than the sum of its proper divisors (15001).

11721071 is an equidigital number, since it uses as much as digits as its factorization.

11721071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15000.

The product of its (nonzero) digits is 98, while the sum is 20.

The square root of 11721071 is about 3423.6049713716. The cubic root of 11721071 is about 227.1550688009.

Adding to 11721071 its reverse (17012711), we get a palindrome (28733782).

The spelling of 11721071 in words is "eleven million, seven hundred twenty-one thousand, seventy-one".