111321221 has 4 divisors (see below), whose sum is σ = 121441344. Its totient is φ = 101201100.

The previous prime is 111321179. The next prime is 111321229. The reversal of 111321221 is 122123111.

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 111321221 - 2¹⁸ = 111059077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111321196 and 111321205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111321229) 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, 5060045 + ... + 5060066.

It is an arithmetic number, because the mean of its divisors is an integer number (30360336).

Almost surely, 2^111321221 is an apocalyptic number.

111321221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111321221 is a deficient number, since it is larger than the sum of its proper divisors (10120123).

111321221 is a wasteful number, since it uses less digits than its factorization.

111321221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10120122.

The product of its digits is 24, while the sum is 14.

The square root of 111321221 is about 10550.8872138792. The cubic root of 111321221 is about 481.0526968572.

Adding to 111321221 its reverse (122123111), we get a palindrome (233444332).

The spelling of 111321221 in words is "one hundred eleven million, three hundred twenty-one thousand, two hundred twenty-one".