221703073 has 2 divisors, whose sum is σ = 221703074. Its totient is φ = 221703072.

The previous prime is 221703047. The next prime is 221703107. The reversal of 221703073 is 370307122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 200845584 + 20857489 = 14172^2 + 4567^2 .

It is a cyclic number.

It is not a de Polignac number, because 221703073 - 2⁹ = 221702561 is a prime.

It is not a weakly prime, because it can be changed into another prime (221703023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110851536 + 110851537.

It is an arithmetic number, because the mean of its divisors is an integer number (110851537).

Almost surely, 2^221703073 is an apocalyptic number.

It is an amenable number.

221703073 is a deficient number, since it is larger than the sum of its proper divisors (1).

221703073 is an equidigital number, since it uses as much as digits as its factorization.

221703073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1764, while the sum is 25.

The square root of 221703073 is about 14889.6968740133. The cubic root of 221703073 is about 605.2348181215.

The spelling of 221703073 in words is "two hundred twenty-one million, seven hundred three thousand, seventy-three".