16321107553441 has 4 divisors (see below), whose sum is σ = 16321116574852. Its totient is φ = 16321098532032.

The previous prime is 16321107553351. The next prime is 16321107553477. The reversal of 16321107553441 is 14435570112361.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 9273675463441 + 7047432090000 = 3045271^2 + 2654700^2 .

It is a cyclic number.

It is not a de Polignac number, because 16321107553441 - 2⁷ = 16321107553313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16321107553741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 754140 + ... + 5762893.

It is an arithmetic number, because the mean of its divisors is an integer number (4080279143713).

Almost surely, 2^{16321107553441} is an apocalyptic number.

It is an amenable number.

16321107553441 is a deficient number, since it is larger than the sum of its proper divisors (9021411).

16321107553441 is an equidigital number, since it uses as much as digits as its factorization.

16321107553441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9021410.

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 16321107553441 in words is "sixteen trillion, three hundred twenty-one billion, one hundred seven million, five hundred fifty-three thousand, four hundred forty-one".