11123221331 has 4 divisors (see below), whose sum is σ = 11221657032. Its totient is φ = 11024785632.

The previous prime is 11123221309. The next prime is 11123221339. The reversal of 11123221331 is 13312232111.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 11123221331 - 2¹⁴ = 11123204947 is a prime.

It is a super-2 number, since 2×11123221331² (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 (11123221339) 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, 49217681 + ... + 49217906.

It is an arithmetic number, because the mean of its divisors is an integer number (2805414258).

Almost surely, 2^11123221331 is an apocalyptic number.

11123221331 is a deficient number, since it is larger than the sum of its proper divisors (98435701).

11123221331 is an equidigital number, since it uses as much as digits as its factorization.

11123221331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98435700.

The product of its digits is 216, while the sum is 20.

Adding to 11123221331 its reverse (13312232111), we get a palindrome (24435453442).

The spelling of 11123221331 in words is "eleven billion, one hundred twenty-three million, two hundred twenty-one thousand, three hundred thirty-one".