40441223231221 has 2 divisors, whose sum is σ = 40441223231222. Its totient is φ = 40441223231220.

The previous prime is 40441223231219. The next prime is 40441223231251. The reversal of 40441223231221 is 12213232214404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28428240530596 + 12012982700625 = 5331814^2 + 3465975^2 .

It is a cyclic number.

It is not a de Polignac number, because 40441223231221 - 2¹ = 40441223231219 is a prime.

Together with 40441223231219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40441223231251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20220611615610 + 20220611615611.

It is an arithmetic number, because the mean of its divisors is an integer number (20220611615611).

Almost surely, 2^{40441223231221} is an apocalyptic number.

It is an amenable number.

40441223231221 is a deficient number, since it is larger than the sum of its proper divisors (1).

40441223231221 is an equidigital number, since it uses as much as digits as its factorization.

40441223231221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 31.

Adding to 40441223231221 its reverse (12213232214404), we get a palindrome (52654455445625).

The spelling of 40441223231221 in words is "forty trillion, four hundred forty-one billion, two hundred twenty-three million, two hundred thirty-one thousand, two hundred twenty-one".