123140434021 has 16 divisors (see below), whose sum is σ = 136388185920. Its totient is φ = 110243502720.

The previous prime is 123140434007. The next prime is 123140434033. The reversal of 123140434021 is 120434041321.

It is a cyclic number.

It is not a de Polignac number, because 123140434021 - 2¹⁷ = 123140302949 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 (123140434121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70315 + ... + 501223.

It is an arithmetic number, because the mean of its divisors is an integer number (8524261620).

Almost surely, 2^123140434021 is an apocalyptic number.

123140434021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

123140434021 is a deficient number, since it is larger than the sum of its proper divisors (13247751899).

123140434021 is a wasteful number, since it uses less digits than its factorization.

123140434021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431316.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 123140434021 its reverse (120434041321), we get a palindrome (243574475342).

The spelling of 123140434021 in words is "one hundred twenty-three billion, one hundred forty million, four hundred thirty-four thousand, twenty-one".