43131240121123 has 24 divisors (see below), whose sum is σ = 54735404391360. Its totient is φ = 33608058235920.

The previous prime is 43131240121111. The next prime is 43131240121139. The reversal of 43131240121123 is 32112104213134.

It is not a de Polignac number, because 43131240121123 - 2²⁵ = 43131206566691 is a prime.

It is a super-2 number, since 2×43131240121123² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 43131240121091 and 43131240121100.

It is not an unprimeable number, because it can be changed into a prime (43131240121223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25849440 + ... + 27467362.

It is an arithmetic number, because the mean of its divisors is an integer number (2280641849640).

Almost surely, 2^{43131240121123} is an apocalyptic number.

43131240121123 is a deficient number, since it is larger than the sum of its proper divisors (11604164270237).

43131240121123 is a wasteful number, since it uses less digits than its factorization.

43131240121123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667407 (or 1667400 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

Adding to 43131240121123 its reverse (32112104213134), we get a palindrome (75243344334257).

The spelling of 43131240121123 in words is "forty-three trillion, one hundred thirty-one billion, two hundred forty million, one hundred twenty-one thousand, one hundred twenty-three".