102221100991 has 2 divisors, whose sum is σ = 102221100992. Its totient is φ = 102221100990.

The previous prime is 102221100977. The next prime is 102221101019. The reversal of 102221100991 is 199001122201.

It is an a-pointer prime, because the next prime (102221101019) can be obtained adding 102221100991 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102221100991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102221100911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51110550495 + 51110550496.

It is an arithmetic number, because the mean of its divisors is an integer number (51110550496).

Almost surely, 2^102221100991 is an apocalyptic number.

102221100991 is a deficient number, since it is larger than the sum of its proper divisors (1).

102221100991 is an equidigital number, since it uses as much as digits as its factorization.

102221100991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 28.

The spelling of 102221100991 in words is "one hundred two billion, two hundred twenty-one million, one hundred thousand, nine hundred ninety-one".