221136673 has 2 divisors, whose sum is σ = 221136674. Its totient is φ = 221136672.

The previous prime is 221136653. The next prime is 221136677. The reversal of 221136673 is 376631122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179881744 + 41254929 = 13412^2 + 6423^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221136673 is a prime.

It is not a weakly prime, because it can be changed into another prime (221136677) 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, 110568336 + 110568337.

It is an arithmetic number, because the mean of its divisors is an integer number (110568337).

Almost surely, 2^221136673 is an apocalyptic number.

It is an amenable number.

221136673 is a deficient number, since it is larger than the sum of its proper divisors (1).

221136673 is an equidigital number, since it uses as much as digits as its factorization.

221136673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 31.

The square root of 221136673 is about 14870.6648472757. The cubic root of 221136673 is about 604.7189669870.

Adding to 221136673 its reverse (376631122), we get a palindrome (597767795).

The spelling of 221136673 in words is "two hundred twenty-one million, one hundred thirty-six thousand, six hundred seventy-three".