33221122220 has 144 divisors (see below), whose sum is σ = 87067921248. Its totient is φ = 10494935040.

The previous prime is 33221122213. The next prime is 33221122229. The reversal of 33221122220 is 2222112233.

It is a happy number.

It is a super-2 number, since 2×33221122220² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 33221122192 and 33221122201.

It is not an unprimeable number, because it can be changed into a prime (33221122229) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 806444 + ... + 846636.

It is an arithmetic number, because the mean of its divisors is an integer number (604638342).

Almost surely, 2^33221122220 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 33221122220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43533960624).

33221122220 is an abundant number, since it is smaller than the sum of its proper divisors (53846799028).

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

33221122220 is a wasteful number, since it uses less digits than its factorization.

33221122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40260 (or 40241 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 33221122220 its reverse (2222112233), we get a palindrome (35443234453).

The spelling of 33221122220 in words is "thirty-three billion, two hundred twenty-one million, one hundred twenty-two thousand, two hundred twenty".