217922177093 has 2 divisors, whose sum is σ = 217922177094. Its totient is φ = 217922177092.

The previous prime is 217922177063. The next prime is 217922177107. The reversal of 217922177093 is 390771229712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216971503204 + 950673889 = 465802^2 + 30833^2 .

It is a cyclic number.

It is not a de Polignac number, because 217922177093 - 2¹² = 217922172997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217922177063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108961088546 + 108961088547.

It is an arithmetic number, because the mean of its divisors is an integer number (108961088547).

Almost surely, 2^217922177093 is an apocalyptic number.

It is an amenable number.

217922177093 is a deficient number, since it is larger than the sum of its proper divisors (1).

217922177093 is an equidigital number, since it uses as much as digits as its factorization.

217922177093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 666792, while the sum is 50.

The spelling of 217922177093 in words is "two hundred seventeen billion, nine hundred twenty-two million, one hundred seventy-seven thousand, ninety-three".