128321101 has 2 divisors, whose sum is σ = 128321102. Its totient is φ = 128321100.

The previous prime is 128321099. The next prime is 128321107. The reversal of 128321101 is 101123821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120890025 + 7431076 = 10995^2 + 2726^2 .

It is an emirp because it is prime and its reverse (101123821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128321101 - 2¹ = 128321099 is a prime.

Together with 128321099, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128321107) 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, 64160550 + 64160551.

It is an arithmetic number, because the mean of its divisors is an integer number (64160551).

Almost surely, 2^128321101 is an apocalyptic number.

It is an amenable number.

128321101 is a deficient number, since it is larger than the sum of its proper divisors (1).

128321101 is an equidigital number, since it uses as much as digits as its factorization.

128321101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 128321101 is about 11327.8904037777. The cubic root of 128321101 is about 504.3894867130.

Adding to 128321101 its reverse (101123821), we get a palindrome (229444922).

The spelling of 128321101 in words is "one hundred twenty-eight million, three hundred twenty-one thousand, one hundred one".