438641732221 has 32 divisors (see below), whose sum is σ = 582129331200. Its totient is φ = 320170942080.

The previous prime is 438641732219. The next prime is 438641732227. The reversal of 438641732221 is 122237146834.

It is not a de Polignac number, because 438641732221 - 2¹ = 438641732219 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 (438641732227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1554195 + ... + 1814608.

It is an arithmetic number, because the mean of its divisors is an integer number (18191541600).

Almost surely, 2^438641732221 is an apocalyptic number.

It is an amenable number.

438641732221 is a deficient number, since it is larger than the sum of its proper divisors (143487598979).

438641732221 is a wasteful number, since it uses less digits than its factorization.

438641732221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3368929.

The product of its digits is 387072, while the sum is 43.

The spelling of 438641732221 in words is "four hundred thirty-eight billion, six hundred forty-one million, seven hundred thirty-two thousand, two hundred twenty-one".