221011122222 has 96 divisors (see below), whose sum is σ = 540192032640. Its totient is φ = 64728480960.

The previous prime is 221011122217. The next prime is 221011122281. The reversal of 221011122222 is 222221110122.

It is a happy number.

It is a super-2 number, since 2×221011122222² (a number of 23 digits) contains 22 as substring.

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 = 221011122195 and 221011122204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 545929 + ... + 860267.

It is an arithmetic number, because the mean of its divisors is an integer number (5627000340).

Almost surely, 2^221011122222 is an apocalyptic number.

221011122222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 221011122222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (270096016320).

221011122222 is an abundant number, since it is smaller than the sum of its proper divisors (319180910418).

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

221011122222 is a wasteful number, since it uses less digits than its factorization.

221011122222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314478 (or 314475 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221011122222 its reverse (222221110122), we get a palindrome (443232232344).

The spelling of 221011122222 in words is "two hundred twenty-one billion, eleven million, one hundred twenty-two thousand, two hundred twenty-two".