40124121013 has 4 divisors (see below), whose sum is σ = 40143404268. Its totient is φ = 40104837760.

The previous prime is 40124121001. The next prime is 40124121043. The reversal of 40124121013 is 31012142104.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10339229124 + 29784891889 = 101682^2 + 172583^2 .

It is a cyclic number.

It is not a de Polignac number, because 40124121013 - 2³³ = 31534186421 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 (40124121043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9638506 + ... + 9642667.

It is an arithmetic number, because the mean of its divisors is an integer number (10035851067).

Almost surely, 2^40124121013 is an apocalyptic number.

It is an amenable number.

40124121013 is a deficient number, since it is larger than the sum of its proper divisors (19283255).

40124121013 is a wasteful number, since it uses less digits than its factorization.

40124121013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19283254.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 40124121013 its reverse (31012142104), we get a palindrome (71136263117).

The spelling of 40124121013 in words is "forty billion, one hundred twenty-four million, one hundred twenty-one thousand, thirteen".