221338138375 has 32 divisors (see below), whose sum is σ = 279643777920. Its totient is φ = 174886624000.

The previous prime is 221338138363. The next prime is 221338138379. The reversal of 221338138375 is 573831833122.

It is not a de Polignac number, because 221338138375 - 2⁷ = 221338138247 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221338138379) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10458054 + ... + 10479196.

It is an arithmetic number, because the mean of its divisors is an integer number (8738868060).

Almost surely, 2^221338138375 is an apocalyptic number.

221338138375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

221338138375 is a deficient number, since it is larger than the sum of its proper divisors (58305639545).

221338138375 is an equidigital number, since it uses as much as digits as its factorization.

221338138375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22188 (or 22178 counting only the distinct ones).

The product of its digits is 725760, while the sum is 46.

The spelling of 221338138375 in words is "two hundred twenty-one billion, three hundred thirty-eight million, one hundred thirty-eight thousand, three hundred seventy-five".