2104555121545 has 4 divisors (see below), whose sum is σ = 2525466145860. Its totient is φ = 1683644097232.

The previous prime is 2104555121527. The next prime is 2104555121567. The reversal of 2104555121545 is 5451215554012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1548869855296 + 555685266249 = 1244536^2 + 745443^2 .

It is a cyclic number.

It is not a de Polignac number, because 2104555121545 - 2¹⁵ = 2104555088777 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 2104555121498 and 2104555121507.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210455512150 + ... + 210455512159.

It is an arithmetic number, because the mean of its divisors is an integer number (631366536465).

Almost surely, 2^{2104555121545} is an apocalyptic number.

It is an amenable number.

2104555121545 is a deficient number, since it is larger than the sum of its proper divisors (420911024315).

2104555121545 is an equidigital number, since it uses as much as digits as its factorization.

2104555121545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420911024314.

The product of its (nonzero) digits is 200000, while the sum is 40.

The spelling of 2104555121545 in words is "two trillion, one hundred four billion, five hundred fifty-five million, one hundred twenty-one thousand, five hundred forty-five".