221143423 has 2 divisors, whose sum is σ = 221143424. Its totient is φ = 221143422.

The previous prime is 221143421. The next prime is 221143441. The reversal of 221143423 is 324341122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221143423 - 2¹ = 221143421 is a prime.

Together with 221143421, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 221143394 and 221143403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221143421) 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 as a sum of consecutive naturals, namely, 110571711 + 110571712.

It is an arithmetic number, because the mean of its divisors is an integer number (110571712).

Almost surely, 2^221143423 is an apocalyptic number.

221143423 is a deficient number, since it is larger than the sum of its proper divisors (1).

221143423 is an equidigital number, since it uses as much as digits as its factorization.

221143423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1152, while the sum is 22.

The square root of 221143423 is about 14870.8918024441. The cubic root of 221143423 is about 604.7251197604.

Adding to 221143423 its reverse (324341122), we get a palindrome (545484545).

The spelling of 221143423 in words is "two hundred twenty-one million, one hundred forty-three thousand, four hundred twenty-three".