40123140021 has 16 divisors (see below), whose sum is σ = 59462323200. Its totient is φ = 26739474624.

The previous prime is 40123140017. The next prime is 40123140061. The reversal of 40123140021 is 12004132104.

It is not a de Polignac number, because 40123140021 - 2² = 40123140017 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40123139976 and 40123140003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40123140061) 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 15 ways as a sum of consecutive naturals, for example, 178261 + ... + 334698.

It is an arithmetic number, because the mean of its divisors is an integer number (3716395200).

Almost surely, 2^40123140021 is an apocalyptic number.

It is an amenable number.

40123140021 is a deficient number, since it is larger than the sum of its proper divisors (19339183179).

40123140021 is a wasteful number, since it uses less digits than its factorization.

40123140021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515865 (or 515859 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 40123140021 its reverse (12004132104), we get a palindrome (52127272125).

The spelling of 40123140021 in words is "forty billion, one hundred twenty-three million, one hundred forty thousand, twenty-one".