221143231 has 2 divisors, whose sum is σ = 221143232. Its totient is φ = 221143230.

The previous prime is 221143201. The next prime is 221143249. The reversal of 221143231 is 132341122.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221143231 - 2¹³ = 221135039 is a prime.

It is a super-2 number, since 2×221143231² = 97808657234238722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221143199 and 221143208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221143201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110571615 + 110571616.

It is an arithmetic number, because the mean of its divisors is an integer number (110571616).

Almost surely, 2^221143231 is an apocalyptic number.

221143231 is a deficient number, since it is larger than the sum of its proper divisors (1).

221143231 is an equidigital number, since it uses as much as digits as its factorization.

221143231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 19.

The square root of 221143231 is about 14870.8853468783. The cubic root of 221143231 is about 604.7249447499.

Adding to 221143231 its reverse (132341122), we get a palindrome (353484353).

The spelling of 221143231 in words is "two hundred twenty-one million, one hundred forty-three thousand, two hundred thirty-one".