221534423342177 has 32 divisors (see below), whose sum is σ = 251309451233280. Its totient is φ = 193535006857920.

The previous prime is 221534423342171. The next prime is 221534423342189. The reversal of 221534423342177 is 771243324435122.

It is a cyclic number.

It is not a de Polignac number, because 221534423342177 - 2²⁰ = 221534422293601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221534423342171) 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, 100283 + ... + 21049439.

It is an arithmetic number, because the mean of its divisors is an integer number (7853420351040).

Almost surely, 2^{221534423342177} is an apocalyptic number.

It is an amenable number.

221534423342177 is a deficient number, since it is larger than the sum of its proper divisors (29775027891103).

221534423342177 is a wasteful number, since it uses less digits than its factorization.

221534423342177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20949573.

The product of its digits is 6773760, while the sum is 50.

Adding to 221534423342177 its reverse (771243324435122), we get a palindrome (992777747777299).

The spelling of 221534423342177 in words is "two hundred twenty-one trillion, five hundred thirty-four billion, four hundred twenty-three million, three hundred forty-two thousand, one hundred seventy-seven".