221111231 has 8 divisors (see below), whose sum is σ = 255401424. Its totient is φ = 189185920.

The previous prime is 221111183. The next prime is 221111249. The reversal of 221111231 is 132111122.

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

It is a de Polignac number, because none of the positive numbers 2^k-221111231 is a prime.

It is a super-2 number, since 2×221111231² = 97780352948670722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221111131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 591020 + ... + 591393.

It is an arithmetic number, because the mean of its divisors is an integer number (31925178).

Almost surely, 2^221111231 is an apocalyptic number.

221111231 is a deficient number, since it is larger than the sum of its proper divisors (34290193).

221111231 is a wasteful number, since it uses less digits than its factorization.

221111231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1182441.

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

The square root of 221111231 is about 14869.8093800829. The cubic root of 221111231 is about 604.6957749194.

Adding to 221111231 its reverse (132111122), we get a palindrome (353222353).

The spelling of 221111231 in words is "two hundred twenty-one million, one hundred eleven thousand, two hundred thirty-one".