391122020221193 has 16 divisors (see below), whose sum is σ = 399378237896976. Its totient is φ = 382944198804480.

The previous prime is 391122020221189. The next prime is 391122020221217.

391122020221193 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 8 ways, for example, as 9462348144649 + 381659672076544 = 3076093^2 + 19536112^2 .

It is a cyclic number.

It is not a de Polignac number, because 391122020221193 - 2² = 391122020221189 is a prime.

It is not an unprimeable number, because it can be changed into a prime (391122020221123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1324194755 + ... + 1324490087.

It is an arithmetic number, because the mean of its divisors is an integer number (24961139868561).

Almost surely, 2^{391122020221193} is an apocalyptic number.

It is an amenable number.

391122020221193 is a deficient number, since it is larger than the sum of its proper divisors (8256217675783).

391122020221193 is a wasteful number, since it uses less digits than its factorization.

391122020221193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427964.

The product of its (nonzero) digits is 23328, while the sum is 38.

The spelling of 391122020221193 in words is "three hundred ninety-one trillion, one hundred twenty-two billion, twenty million, two hundred twenty-one thousand, one hundred ninety-three".