1321123140431 has 4 divisors (see below), whose sum is σ = 1321346951712. Its totient is φ = 1320899329152.

The previous prime is 1321123140413. The next prime is 1321123140457. The reversal of 1321123140431 is 1340413211231.

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

It is a cyclic number.

It is not a de Polignac number, because 1321123140431 - 2⁶ = 1321123140367 is a prime.

It is a super-2 number, since 2×1321123140431² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1321123140431.

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 3 ways as a sum of consecutive naturals, for example, 111896786 + ... + 111908591.

It is an arithmetic number, because the mean of its divisors is an integer number (330336737928).

Almost surely, 2^{1321123140431} is an apocalyptic number.

1321123140431 is a deficient number, since it is larger than the sum of its proper divisors (223811281).

1321123140431 is an equidigital number, since it uses as much as digits as its factorization.

1321123140431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223811280.

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 1321123140431 its reverse (1340413211231), we get a palindrome (2661536351662).

The spelling of 1321123140431 in words is "one trillion, three hundred twenty-one billion, one hundred twenty-three million, one hundred forty thousand, four hundred thirty-one".