221206673 has 2 divisors, whose sum is σ = 221206674. Its totient is φ = 221206672.

The previous prime is 221206651. The next prime is 221206691. The reversal of 221206673 is 376602122.

221206673 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 can be written as a sum of positive squares in only one way, i.e., 200703889 + 20502784 = 14167^2 + 4528^2 .

It is a cyclic number.

It is not a de Polignac number, because 221206673 - 2²⁰ = 220158097 is a prime.

It is not a weakly prime, because it can be changed into another prime (221200673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110603336 + 110603337.

It is an arithmetic number, because the mean of its divisors is an integer number (110603337).

Almost surely, 2^221206673 is an apocalyptic number.

It is an amenable number.

221206673 is a deficient number, since it is larger than the sum of its proper divisors (1).

221206673 is an equidigital number, since it uses as much as digits as its factorization.

221206673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 221206673 is about 14873.0182881620. The cubic root of 221206673 is about 604.7827674434.

Adding to 221206673 its reverse (376602122), we get a palindrome (597808795).

The spelling of 221206673 in words is "two hundred twenty-one million, two hundred six thousand, six hundred seventy-three".