140431240121 has 4 divisors (see below), whose sum is σ = 140441027700. Its totient is φ = 140421452544.

The previous prime is 140431240087. The next prime is 140431240123. The reversal of 140431240121 is 121042134041.

140431240121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 121042134041 = 69929 ⋅1730929.

It can be written as a sum of positive squares in 2 ways, for example, as 118804302400 + 21626937721 = 344680^2 + 147061^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140431240121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (140431240123) 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, 4872236 + ... + 4900973.

It is an arithmetic number, because the mean of its divisors is an integer number (35110256925).

Almost surely, 2^140431240121 is an apocalyptic number.

It is an amenable number.

140431240121 is a deficient number, since it is larger than the sum of its proper divisors (9787579).

140431240121 is an equidigital number, since it uses as much as digits as its factorization.

140431240121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9787578.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 140431240121 its reverse (121042134041), we get a palindrome (261473374162).

The spelling of 140431240121 in words is "one hundred forty billion, four hundred thirty-one million, two hundred forty thousand, one hundred twenty-one".