221003423 has 2 divisors, whose sum is σ = 221003424. Its totient is φ = 221003422.

The previous prime is 221003413. The next prime is 221003437. The reversal of 221003423 is 324300122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221003423 - 2¹⁰ = 221002399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221003413) 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, 110501711 + 110501712.

It is an arithmetic number, because the mean of its divisors is an integer number (110501712).

Almost surely, 2^221003423 is an apocalyptic number.

221003423 is a deficient number, since it is larger than the sum of its proper divisors (1).

221003423 is an equidigital number, since it uses as much as digits as its factorization.

221003423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 221003423 is about 14866.1838748214. The cubic root of 221003423 is about 604.5974810429.

Adding to 221003423 its reverse (324300122), we get a palindrome (545303545).

The spelling of 221003423 in words is "two hundred twenty-one million, three thousand, four hundred twenty-three".