40404124221 has 4 divisors (see below), whose sum is σ = 53872165632. Its totient is φ = 26936082812.

The previous prime is 40404124193. The next prime is 40404124259. The reversal of 40404124221 is 12242140404.

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 40404124221 - 2¹⁰ = 40404123197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40404124191 and 40404124200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40404124261) 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, 6734020701 + ... + 6734020706.

It is an arithmetic number, because the mean of its divisors is an integer number (13468041408).

Almost surely, 2^40404124221 is an apocalyptic number.

It is an amenable number.

40404124221 is a deficient number, since it is larger than the sum of its proper divisors (13468041411).

40404124221 is a wasteful number, since it uses less digits than its factorization.

40404124221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13468041410.

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

Adding to 40404124221 its reverse (12242140404), we get a palindrome (52646264625).

The spelling of 40404124221 in words is "forty billion, four hundred four million, one hundred twenty-four thousand, two hundred twenty-one".