1321123140405 has 12 divisors (see below), whose sum is σ = 2289946776780. Its totient is φ = 704599008192.

The previous prime is 1321123140401. The next prime is 1321123140413. The reversal of 1321123140405 is 5040413211231.

1321123140405 is a `hidden beast` number, since 1 + 3 + 2 + 112 + 3 + 140 + 405 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 848605755204 + 472517385201 = 921198^2 + 687399^2 .

It is not a de Polignac number, because 1321123140405 - 2² = 1321123140401 is a prime.

It is a super-2 number, since 2×1321123140405² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321123140401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14679145960 + ... + 14679146049.

It is an arithmetic number, because the mean of its divisors is an integer number (190828898065).

Almost surely, 2^{1321123140405} is an apocalyptic number.

1321123140405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1321123140405 is a deficient number, since it is larger than the sum of its proper divisors (968823636375).

1321123140405 is a wasteful number, since it uses less digits than its factorization.

1321123140405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29358292020 (or 29358292017 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

Adding to 1321123140405 its reverse (5040413211231), we get a palindrome (6361536351636).

The spelling of 1321123140405 in words is "one trillion, three hundred twenty-one billion, one hundred twenty-three million, one hundred forty thousand, four hundred five".