221423243 has 2 divisors, whose sum is σ = 221423244. Its totient is φ = 221423242.

The previous prime is 221423203. The next prime is 221423263. The reversal of 221423243 is 342324122.

221423243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221423243 - 2¹⁴ = 221406859 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (221423203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110711621 + 110711622.

It is an arithmetic number, because the mean of its divisors is an integer number (110711622).

Almost surely, 2^221423243 is an apocalyptic number.

221423243 is a deficient number, since it is larger than the sum of its proper divisors (1).

221423243 is an equidigital number, since it uses as much as digits as its factorization.

221423243 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 23.

The square root of 221423243 is about 14880.2971408504. The cubic root of 221423243 is about 604.9800717430.

Adding to 221423243 its reverse (342324122), we get a palindrome (563747365).

The spelling of 221423243 in words is "two hundred twenty-one million, four hundred twenty-three thousand, two hundred forty-three".