221100012111222 has 144 divisors (see below), whose sum is σ = 521410040594352. Its totient is φ = 67476888207360.

The previous prime is 221100012111221. The next prime is 221100012111241. The reversal of 221100012111222 is 222111210001122.

221100012111222 is a `hidden beast` number, since 221 + 10 + 0 + 0 + 1 + 211 + 1 + 222 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 221100012111195 and 221100012111204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221100012111221) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2279262573 + ... + 2279359575.

It is an arithmetic number, because the mean of its divisors is an integer number (3620903059683).

Almost surely, 2^{221100012111222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221100012111222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260705020297176).

221100012111222 is an abundant number, since it is smaller than the sum of its proper divisors (300310028483130).

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

221100012111222 is a wasteful number, since it uses less digits than its factorization.

221100012111222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102543 (or 102503 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 221100012111222 its reverse (222111210001122), we get a palindrome (443211222112344).

The spelling of 221100012111222 in words is "two hundred twenty-one trillion, one hundred billion, twelve million, one hundred eleven thousand, two hundred twenty-two".