221524243672138 has 8 divisors (see below), whose sum is σ = 362494216918080. Its totient is φ = 100692838032780.

The previous prime is 221524243672129. The next prime is 221524243672157. The reversal of 221524243672138 is 831276342425122.

221524243672138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5034641901618 + ... + 5034641901661.

It is an arithmetic number, because the mean of its divisors is an integer number (45311777114760).

Almost surely, 2^{221524243672138} is an apocalyptic number.

221524243672138 is a deficient number, since it is larger than the sum of its proper divisors (140969973245942).

221524243672138 is a wasteful number, since it uses less digits than its factorization.

221524243672138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10069283803292.

The product of its digits is 7741440, while the sum is 52.

The spelling of 221524243672138 in words is "two hundred twenty-one trillion, five hundred twenty-four billion, two hundred forty-three million, six hundred seventy-two thousand, one hundred thirty-eight".