111211321 has 4 divisors (see below), whose sum is σ = 119766052. Its totient is φ = 102656592.

The previous prime is 111211319. The next prime is 111211333. The reversal of 111211321 is 123112111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123112111 = 1151 ⋅106961.

It can be written as a sum of positive squares in 2 ways, for example, as 30858025 + 80353296 = 5555^2 + 8964^2 .

It is a cyclic number.

It is not a de Polignac number, because 111211321 - 2¹ = 111211319 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 8554717 = 111211321 / (1 + 1 + 1 + 2 + 1 + 1 + 3 + 2 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111211021) 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, 4277346 + ... + 4277371.

It is an arithmetic number, because the mean of its divisors is an integer number (29941513).

Almost surely, 2^111211321 is an apocalyptic number.

It is an amenable number.

111211321 is a deficient number, since it is larger than the sum of its proper divisors (8554731).

111211321 is an equidigital number, since it uses as much as digits as its factorization.

111211321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8554730.

The product of its digits is 12, while the sum is 13.

The square root of 111211321 is about 10545.6778350185. The cubic root of 111211321 is about 480.8943410108.

Adding to 111211321 its reverse (123112111), we get a palindrome (234323432).

The spelling of 111211321 in words is "one hundred eleven million, two hundred eleven thousand, three hundred twenty-one".