140505431621 has 4 divisors (see below), whose sum is σ = 140840767200. Its totient is φ = 140170096044.

The previous prime is 140505431609. The next prime is 140505431629. The reversal of 140505431621 is 126134505041.

140505431621 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 126134505041 = 348643 ⋅361787.

It is a cyclic number.

It is not a de Polignac number, because 140505431621 - 2⁶ = 140505431557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140505431629) 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, 167667161 + ... + 167667998.

It is an arithmetic number, because the mean of its divisors is an integer number (35210191800).

Almost surely, 2^140505431621 is an apocalyptic number.

It is an amenable number.

140505431621 is a deficient number, since it is larger than the sum of its proper divisors (335335579).

140505431621 is an equidigital number, since it uses as much as digits as its factorization.

140505431621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335335578.

The product of its (nonzero) digits is 14400, while the sum is 32.

Adding to 140505431621 its reverse (126134505041), we get a palindrome (266639936662).

The spelling of 140505431621 in words is "one hundred forty billion, five hundred five million, four hundred thirty-one thousand, six hundred twenty-one".