221123723 has 2 divisors, whose sum is σ = 221123724. Its totient is φ = 221123722.

The previous prime is 221123717. The next prime is 221123731. The reversal of 221123723 is 327321122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221123723 - 2⁸ = 221123467 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (221113723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110561861 + 110561862.

It is an arithmetic number, because the mean of its divisors is an integer number (110561862).

Almost surely, 2^221123723 is an apocalyptic number.

221123723 is a deficient number, since it is larger than the sum of its proper divisors (1).

221123723 is an equidigital number, since it uses as much as digits as its factorization.

221123723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 23.

The square root of 221123723 is about 14870.2294198845. The cubic root of 221123723 is about 604.7071624269.

Adding to 221123723 its reverse (327321122), we get a palindrome (548444845).

The spelling of 221123723 in words is "two hundred twenty-one million, one hundred twenty-three thousand, seven hundred twenty-three".