221211113 has 8 divisors (see below), whose sum is σ = 227048136. Its totient is φ = 215395200.

The previous prime is 221211083. The next prime is 221211127. The reversal of 221211113 is 311112122.

It can be written as a sum of positive squares in 4 ways, for example, as 5326864 + 215884249 = 2308^2 + 14693^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221211113 - 2¹⁸ = 220948969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221211163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17195 + ... + 27167.

It is an arithmetic number, because the mean of its divisors is an integer number (28381017).

Almost surely, 2^221211113 is an apocalyptic number.

It is an amenable number.

221211113 is a deficient number, since it is larger than the sum of its proper divisors (5837023).

221211113 is an equidigital number, since it uses as much as digits as its factorization.

221211113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10555.

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

The square root of 221211113 is about 14873.1675509960. The cubic root of 221211113 is about 604.7868137613.

Adding to 221211113 its reverse (311112122), we get a palindrome (532323235).

The spelling of 221211113 in words is "two hundred twenty-one million, two hundred eleven thousand, one hundred thirteen".