11111323331 has 4 divisors (see below), whose sum is σ = 11121166200. Its totient is φ = 11101480464.

The previous prime is 11111323309. The next prime is 11111323343. The reversal of 11111323331 is 13332311111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13332311111 = 7 ⋅1904615873.

It is a cyclic number.

It is not a de Polignac number, because 11111323331 - 2¹⁰ = 11111322307 is a prime.

It is a super-2 number, since 2×11111323331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11111323351) 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, 4919741 + ... + 4921998.

It is an arithmetic number, because the mean of its divisors is an integer number (2780291550).

Almost surely, 2^11111323331 is an apocalyptic number.

11111323331 is a deficient number, since it is larger than the sum of its proper divisors (9842869).

11111323331 is an equidigital number, since it uses as much as digits as its factorization.

11111323331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9842868.

The product of its digits is 162, while the sum is 20.

Adding to 11111323331 its reverse (13332311111), we get a palindrome (24443634442).

It can be divided in two parts, 1111 and 1323331, that multiplied together give a palindrome (1470220741).

The spelling of 11111323331 in words is "eleven billion, one hundred eleven million, three hundred twenty-three thousand, three hundred thirty-one".