221222231 has 4 divisors (see below), whose sum is σ = 228358464. Its totient is φ = 214086000.

The previous prime is 221222213. The next prime is 221222249. The reversal of 221222231 is 132222122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132222122 = 2 ⋅66111061.

It is an interprime number because it is at equal distance from previous prime (221222213) and next prime (221222249).

It is not a de Polignac number, because 221222231 - 2⁶ = 221222167 is a prime.

It is a super-2 number, since 2×221222231² = 97878550977234722, 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 (221222251) 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 3 ways as a sum of consecutive naturals, for example, 3568070 + ... + 3568131.

It is an arithmetic number, because the mean of its divisors is an integer number (57089616).

Almost surely, 2^221222231 is an apocalyptic number.

221222231 is a deficient number, since it is larger than the sum of its proper divisors (7136233).

221222231 is an equidigital number, since it uses as much as digits as its factorization.

221222231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7136232.

The product of its digits is 192, while the sum is 17.

The square root of 221222231 is about 14873.5413066290. The cubic root of 221222231 is about 604.7969457223.

Adding to 221222231 its reverse (132222122), we get a palindrome (353444353).

The spelling of 221222231 in words is "two hundred twenty-one million, two hundred twenty-two thousand, two hundred thirty-one".