111001223221 has 4 divisors (see below), whose sum is σ = 126858540832. Its totient is φ = 95143905612.

The previous prime is 111001223213. The next prime is 111001223227. The reversal of 111001223221 is 122322100111.

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 not a de Polignac number, because 111001223221 - 2³ = 111001223213 is a prime.

It is a super-2 number, since 2×111001223221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111001223195 and 111001223204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111001223227) 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, 7928658795 + ... + 7928658808.

It is an arithmetic number, because the mean of its divisors is an integer number (31714635208).

Almost surely, 2^111001223221 is an apocalyptic number.

It is an amenable number.

111001223221 is a deficient number, since it is larger than the sum of its proper divisors (15857317611).

111001223221 is an equidigital number, since it uses as much as digits as its factorization.

111001223221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15857317610.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 111001223221 its reverse (122322100111), we get a palindrome (233323323332).

It can be divided in two parts, 11100 and 1223221, that added together give a palindrome (1234321).

The spelling of 111001223221 in words is "one hundred eleven billion, one million, two hundred twenty-three thousand, two hundred twenty-one".