404040244040221 has 4 divisors (see below), whose sum is σ = 404056213404444. Its totient is φ = 404024274676000.

The previous prime is 404040244040201. The next prime is 404040244040227. The reversal of 404040244040221 is 122040442040404.

It is a happy number.

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 111498182932900 + 292542061107321 = 10559270^2 + 17103861^2 .

It is a cyclic number.

It is not a de Polignac number, because 404040244040221 - 2²⁷ = 404040109822493 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 (404040244040227) 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, 7984644160 + ... + 7984694761.

It is an arithmetic number, because the mean of its divisors is an integer number (101014053351111).

Almost surely, 2^{404040244040221} is an apocalyptic number.

It is an amenable number.

404040244040221 is a deficient number, since it is larger than the sum of its proper divisors (15969364223).

404040244040221 is a wasteful number, since it uses less digits than its factorization.

404040244040221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15969364222.

The product of its (nonzero) digits is 32768, while the sum is 31.

Adding to 404040244040221 its reverse (122040442040404), we get a palindrome (526080686080625).

The spelling of 404040244040221 in words is "four hundred four trillion, forty billion, two hundred forty-four million, forty thousand, two hundred twenty-one".