11111321 has 8 divisors (see below), whose sum is σ = 12379080. Its totient is φ = 9902592.

The previous prime is 11111311. The next prime is 11111327. The reversal of 11111321 is 12311111.

It is a happy number.

11111321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 55696 + 11055625 = 236^2 + 3325^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11111321 is a prime.

It is a super-2 number, since 2×11111321² = 246922908730082, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11111327) 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, 14360 + ... + 15113.

It is an arithmetic number, because the mean of its divisors is an integer number (1547385).

Almost surely, 2^11111321 is an apocalyptic number.

It is an amenable number.

11111321 is a deficient number, since it is larger than the sum of its proper divisors (1267759).

11111321 is a wasteful number, since it uses less digits than its factorization.

11111321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29515.

The product of its digits is 6, while the sum is 11.

The square root of 11111321 is about 3333.3648165180. The cubic root of 11111321 is about 223.1457217506.

Adding to 11111321 its reverse (12311111), we get a palindrome (23422432).

The spelling of 11111321 in words is "eleven million, one hundred eleven thousand, three hundred twenty-one".