2131404400045 has 4 divisors (see below), whose sum is σ = 2557685280060. Its totient is φ = 1705123520032.

The previous prime is 2131404400043. The next prime is 2131404400051. The reversal of 2131404400045 is 5400044041312.

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 1195562922724 + 935841477321 = 1093418^2 + 967389^2 .

It is a cyclic number.

It is not a de Polignac number, because 2131404400045 - 2¹ = 2131404400043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2131404399986 and 2131404400022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131404400043) 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 3 ways as a sum of consecutive naturals, for example, 213140440000 + ... + 213140440009.

It is an arithmetic number, because the mean of its divisors is an integer number (639421320015).

Almost surely, 2^{2131404400045} is an apocalyptic number.

It is an amenable number.

2131404400045 is a deficient number, since it is larger than the sum of its proper divisors (426280880015).

2131404400045 is an equidigital number, since it uses as much as digits as its factorization.

2131404400045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426280880014.

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 2131404400045 its reverse (5400044041312), we get a palindrome (7531448441357).

The spelling of 2131404400045 in words is "two trillion, one hundred thirty-one billion, four hundred four million, four hundred thousand, forty-five".