222721973856 has 144 divisors (see below), whose sum is σ = 657953150400. Its totient is φ = 71380076544.

The previous prime is 222721973801. The next prime is 222721973857. The reversal of 222721973856 is 658379127222.

222721973856 is a `hidden beast` number, since 2 + 2 + 2 + 72 + 197 + 385 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222721973857) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1940340 + ... + 2051916.

It is an arithmetic number, because the mean of its divisors is an integer number (4569119100).

Almost surely, 2^222721973856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 222721973856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (328976575200).

222721973856 is an abundant number, since it is smaller than the sum of its proper divisors (435231176544).

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

222721973856 is a wasteful number, since it uses less digits than its factorization.

222721973856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111861 (or 111850 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 54.

The spelling of 222721973856 in words is "two hundred twenty-two billion, seven hundred twenty-one million, nine hundred seventy-three thousand, eight hundred fifty-six".