221221200438 has 32 divisors (see below), whose sum is σ = 561831621120. Its totient is φ = 63206057160.

The previous prime is 221221200427. The next prime is 221221200509. The reversal of 221221200438 is 834002122122.

221221200438 is a `hidden beast` number, since 2 + 2 + 1 + 2 + 21 + 200 + 438 = 666.

221221200438 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 292620258 + ... + 292621013.

It is an arithmetic number, because the mean of its divisors is an integer number (17557238160).

Almost surely, 2^221221200438 is an apocalyptic number.

221221200438 is an abundant number, since it is smaller than the sum of its proper divisors (340610420682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221221200438 is a wasteful number, since it uses less digits than its factorization.

221221200438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585241289 (or 585241283 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The spelling of 221221200438 in words is "two hundred twenty-one billion, two hundred twenty-one million, two hundred thousand, four hundred thirty-eight".