221248723 has 2 divisors, whose sum is σ = 221248724. Its totient is φ = 221248722.

The previous prime is 221248721. The next prime is 221248733. The reversal of 221248723 is 327842122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221248723 - 2¹ = 221248721 is a prime.

Together with 221248721, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (221248721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110624361 + 110624362.

It is an arithmetic number, because the mean of its divisors is an integer number (110624362).

Almost surely, 2^221248723 is an apocalyptic number.

221248723 is a deficient number, since it is larger than the sum of its proper divisors (1).

221248723 is an equidigital number, since it uses as much as digits as its factorization.

221248723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10752, while the sum is 31.

The square root of 221248723 is about 14874.4318546962. The cubic root of 221248723 is about 604.8210868180.

The spelling of 221248723 in words is "two hundred twenty-one million, two hundred forty-eight thousand, seven hundred twenty-three".