40404400004121 has 4 divisors (see below), whose sum is σ = 53872533338832. Its totient is φ = 26936266669412.

The previous prime is 40404400004057. The next prime is 40404400004149. The reversal of 40404400004121 is 12140000440404.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 40404400004121 - 2⁶ = 40404400004057 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40404400004091 and 40404400004100.

It is not an unprimeable number, because it can be changed into a prime (40404400004161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6734066667351 + ... + 6734066667356.

It is an arithmetic number, because the mean of its divisors is an integer number (13468133334708).

Almost surely, 2^{40404400004121} is an apocalyptic number.

It is an amenable number.

40404400004121 is a deficient number, since it is larger than the sum of its proper divisors (13468133334711).

40404400004121 is a wasteful number, since it uses less digits than its factorization.

40404400004121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13468133334710.

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 40404400004121 its reverse (12140000440404), we get a palindrome (52544400444525).

The spelling of 40404400004121 in words is "forty trillion, four hundred four billion, four hundred million, four thousand, one hundred twenty-one".