2221231 has 2 divisors, whose sum is σ = 2221232. Its totient is φ = 2221230.

The previous prime is 2221229. The next prime is 2221249. The reversal of 2221231 is 1321222.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2221231 - 2¹ = 2221229 is a prime.

It is a super-4 number, since 4×2221231⁴ (a number of 26 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

Together with 2221229, it forms a pair of twin primes.

It is equal to p₁₆₄₁₀₁ and since 2221231 and 164101 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2221031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1110615 + 1110616.

It is an arithmetic number, because the mean of its divisors is an integer number (1110616).

2^2221231 is an apocalyptic number.

2221231 is a deficient number, since it is larger than the sum of its proper divisors (1).

2221231 is an equidigital number, since it uses as much as digits as its factorization.

2221231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48, while the sum is 13.

The square root of 2221231 is about 1490.3794818770. The cubic root of 2221231 is about 130.4761826344.

Adding to 2221231 its reverse (1321222), we get a palindrome (3542453).

Subtracting from 2221231 its reverse (1321222), we obtain a palindrome (900009).

The spelling of 2221231 in words is "two million, two hundred twenty-one thousand, two hundred thirty-one".