221327127918 has 112 divisors (see below), whose sum is σ = 542074574160. Its totient is φ = 67334965632.

The previous prime is 221327127913. The next prime is 221327127929. The reversal of 221327127918 is 819721723122.

221327127918 is a `hidden beast` number, since 221 + 327 + 12 + 7 + 91 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221327127913) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1621305 + ... + 1752507.

It is an arithmetic number, because the mean of its divisors is an integer number (4839951555).

Almost surely, 2^221327127918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221327127918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (271037287080).

221327127918 is an abundant number, since it is smaller than the sum of its proper divisors (320747446242).

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

221327127918 is a wasteful number, since it uses less digits than its factorization.

221327127918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131325 (or 131310 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The spelling of 221327127918 in words is "two hundred twenty-one billion, three hundred twenty-seven million, one hundred twenty-seven thousand, nine hundred eighteen".