11221571 has 4 divisors (see below), whose sum is σ = 11812200. Its totient is φ = 10630944.

The previous prime is 11221559. The next prime is 11221601. The reversal of 11221571 is 17512211.

It is a happy number.

11221571 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11221571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11221501) 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, 295286 + ... + 295323.

It is an arithmetic number, because the mean of its divisors is an integer number (2953050).

Almost surely, 2^11221571 is an apocalyptic number.

11221571 is a deficient number, since it is larger than the sum of its proper divisors (590629).

11221571 is an equidigital number, since it uses as much as digits as its factorization.

11221571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590628.

The product of its digits is 140, while the sum is 20.

The square root of 11221571 is about 3349.8613404140. The cubic root of 11221571 is about 223.8813346283.

Adding to 11221571 its reverse (17512211), we get a palindrome (28733782).

The spelling of 11221571 in words is "eleven million, two hundred twenty-one thousand, five hundred seventy-one".