221677193 has 2 divisors, whose sum is σ = 221677194. Its totient is φ = 221677192.

The previous prime is 221677163. The next prime is 221677207. The reversal of 221677193 is 391776122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221652544 + 24649 = 14888^2 + 157^2 .

It is a cyclic number.

It is not a de Polignac number, because 221677193 - 2¹² = 221673097 is a prime.

It is not a weakly prime, because it can be changed into another prime (221677153) 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, 110838596 + 110838597.

It is an arithmetic number, because the mean of its divisors is an integer number (110838597).

Almost surely, 2^221677193 is an apocalyptic number.

It is an amenable number.

221677193 is a deficient number, since it is larger than the sum of its proper divisors (1).

221677193 is an equidigital number, since it uses as much as digits as its factorization.

221677193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31752, while the sum is 38.

The square root of 221677193 is about 14888.8277913340. The cubic root of 221677193 is about 605.2112669721.

The spelling of 221677193 in words is "two hundred twenty-one million, six hundred seventy-seven thousand, one hundred ninety-three".