221102199977 has 2 divisors, whose sum is σ = 221102199978. Its totient is φ = 221102199976.

The previous prime is 221102199953. The next prime is 221102199979. The reversal of 221102199977 is 779991201122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214539417856 + 6562782121 = 463184^2 + 81011^2 .

It is a cyclic number.

It is not a de Polignac number, because 221102199977 - 2²² = 221098005673 is a prime.

Together with 221102199979, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (221102199979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110551099988 + 110551099989.

It is an arithmetic number, because the mean of its divisors is an integer number (110551099989).

Almost surely, 2^221102199977 is an apocalyptic number.

It is an amenable number.

221102199977 is a deficient number, since it is larger than the sum of its proper divisors (1).

221102199977 is an equidigital number, since it uses as much as digits as its factorization.

221102199977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 285768, while the sum is 50.

The spelling of 221102199977 in words is "two hundred twenty-one billion, one hundred two million, one hundred ninety-nine thousand, nine hundred seventy-seven".