111323031221 has 4 divisors (see below), whose sum is σ = 111323867712. Its totient is φ = 111322194732.

The previous prime is 111323031191. The next prime is 111323031247. The reversal of 111323031221 is 122130323111.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 122130323111 = 47 ⋅2598517513.

It is a cyclic number.

It is not a de Polignac number, because 111323031221 - 2²² = 111318836917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111323031193 and 111323031202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111323001221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169181 + ... + 501266.

It is an arithmetic number, because the mean of its divisors is an integer number (27830966928).

Almost surely, 2^111323031221 is an apocalyptic number.

It is an amenable number.

111323031221 is a deficient number, since it is larger than the sum of its proper divisors (836491).

111323031221 is an equidigital number, since it uses as much as digits as its factorization.

111323031221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 836490.

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

Adding to 111323031221 its reverse (122130323111), we get a palindrome (233453354332).

The spelling of 111323031221 in words is "one hundred eleven billion, three hundred twenty-three million, thirty-one thousand, two hundred twenty-one".