11232721 has 4 divisors (see below), whose sum is σ = 11244352. Its totient is φ = 11221092.

The previous prime is 11232713. The next prime is 11232731. The reversal of 11232721 is 12723211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 11232721 - 2³ = 11232713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11232731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4221 + ... + 6346.

It is an arithmetic number, because the mean of its divisors is an integer number (2811088).

Almost surely, 2^11232721 is an apocalyptic number.

It is an amenable number.

11232721 is a deficient number, since it is larger than the sum of its proper divisors (11631).

11232721 is a wasteful number, since it uses less digits than its factorization.

11232721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11630.

The product of its digits is 168, while the sum is 19.

The square root of 11232721 is about 3351.5251752001. The cubic root of 11232721 is about 223.9554612234.

Adding to 11232721 its reverse (12723211), we get a palindrome (23955932).

It can be divided in two parts, 1123 and 2721, that added together give a square (3844 = 62²).

The spelling of 11232721 in words is "eleven million, two hundred thirty-two thousand, seven hundred twenty-one".