221331113 has 4 divisors (see below), whose sum is σ = 221924868. Its totient is φ = 220737360.

The previous prime is 221331107. The next prime is 221331137. The reversal of 221331113 is 311133122.

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

It can be written as a sum of positive squares in 2 ways, for example, as 40347904 + 180983209 = 6352^2 + 13453^2 .

It is a cyclic number.

It is not a de Polignac number, because 221331113 - 2¹² = 221327017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221331091 and 221331100.

It is not an unprimeable number, because it can be changed into a prime (221331013) 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, 296318 + ... + 297063.

It is an arithmetic number, because the mean of its divisors is an integer number (55481217).

Almost surely, 2^221331113 is an apocalyptic number.

It is an amenable number.

221331113 is a deficient number, since it is larger than the sum of its proper divisors (593755).

221331113 is an equidigital number, since it uses as much as digits as its factorization.

221331113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593754.

The product of its digits is 108, while the sum is 17.

The square root of 221331113 is about 14877.2011144570. The cubic root of 221331113 is about 604.8961532025.

Adding to 221331113 its reverse (311133122), we get a palindrome (532464235).

The spelling of 221331113 in words is "two hundred twenty-one million, three hundred thirty-one thousand, one hundred thirteen".