221120231 has 2 divisors, whose sum is σ = 221120232. Its totient is φ = 221120230.

The previous prime is 221120219. The next prime is 221120239. The reversal of 221120231 is 132021122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221120231 - 2¹⁸ = 220858087 is a prime.

It is a super-2 number, since 2×221120231² = 97788313114986722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221120239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110560115 + 110560116.

It is an arithmetic number, because the mean of its divisors is an integer number (110560116).

Almost surely, 2^221120231 is an apocalyptic number.

221120231 is a deficient number, since it is larger than the sum of its proper divisors (1).

221120231 is an equidigital number, since it uses as much as digits as its factorization.

221120231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 221120231 is about 14870.1120036132. The cubic root of 221120231 is about 604.7039792187.

Adding to 221120231 its reverse (132021122), we get a palindrome (353141353).

The spelling of 221120231 in words is "two hundred twenty-one million, one hundred twenty thousand, two hundred thirty-one".