221411231 has 2 divisors, whose sum is σ = 221411232. Its totient is φ = 221411230.

The previous prime is 221411227. The next prime is 221411233. The reversal of 221411231 is 132114122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221411231 - 2² = 221411227 is a prime.

It is a super-2 number, since 2×221411231² = 98045866425870722, which contains 22 as substring.

Together with 221411233, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221411233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110705615 + 110705616.

It is an arithmetic number, because the mean of its divisors is an integer number (110705616).

Almost surely, 2^221411231 is an apocalyptic number.

221411231 is a deficient number, since it is larger than the sum of its proper divisors (1).

221411231 is an equidigital number, since it uses as much as digits as its factorization.

221411231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96, while the sum is 17.

The square root of 221411231 is about 14879.8935144039. The cubic root of 221411231 is about 604.9691316810.

Adding to 221411231 its reverse (132114122), we get a palindrome (353525353).

The spelling of 221411231 in words is "two hundred twenty-one million, four hundred eleven thousand, two hundred thirty-one".