11572221 has 8 divisors (see below), whose sum is σ = 15448960. Its totient is φ = 7705152.

The previous prime is 11572213. The next prime is 11572241. The reversal of 11572221 is 12227511.

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

It is not a de Polignac number, because 11572221 - 2³ = 11572213 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 (11572241) 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, 1116 + ... + 4938.

It is an arithmetic number, because the mean of its divisors is an integer number (1931120).

Almost surely, 2^11572221 is an apocalyptic number.

It is an amenable number.

11572221 is a deficient number, since it is larger than the sum of its proper divisors (3876739).

11572221 is a wasteful number, since it uses less digits than its factorization.

11572221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4835.

The product of its digits is 280, while the sum is 21.

The square root of 11572221 is about 3401.7967311408. The cubic root of 11572221 is about 226.1893953647.

Adding to 11572221 its reverse (12227511), we get a palindrome (23799732).

The spelling of 11572221 in words is "eleven million, five hundred seventy-two thousand, two hundred twenty-one".