33221331220 has 96 divisors (see below), whose sum is σ = 88080814080. Its totient is φ = 10223591040.

The previous prime is 33221331181. The next prime is 33221331251. The reversal of 33221331220 is 2213312233.

It is a super-2 number, since 2×33221331220² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 33221331191 and 33221331200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14874 + ... + 258193.

It is an arithmetic number, because the mean of its divisors is an integer number (917508480).

Almost surely, 2^33221331220 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 33221331220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44040407040).

33221331220 is an abundant number, since it is smaller than the sum of its proper divisors (54859482860).

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

33221331220 is a wasteful number, since it uses less digits than its factorization.

33221331220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273173 (or 273171 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 33221331220 its reverse (2213312233), we get a palindrome (35434643453).

It can be divided in two parts, 3 and 3221331220, that added together give a palindrome (3221331223).

The spelling of 33221331220 in words is "thirty-three billion, two hundred twenty-one million, three hundred thirty-one thousand, two hundred twenty".