33121332220 has 96 divisors (see below), whose sum is σ = 75682252800. Its totient is φ = 12126987264.

The previous prime is 33121332121. The next prime is 33121332269. The reversal of 33121332220 is 2223312133.

It is a super-2 number, since 2×33121332220² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 33121332191 and 33121332200.

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, 3489441 + ... + 3498919.

It is an arithmetic number, because the mean of its divisors is an integer number (788356800).

Almost surely, 2^33121332220 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 33121332220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37841126400).

33121332220 is an abundant number, since it is smaller than the sum of its proper divisors (42560920580).

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

33121332220 is a wasteful number, since it uses less digits than its factorization.

33121332220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9787 (or 9785 counting only the distinct ones).

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

Adding to 33121332220 its reverse (2223312133), we get a palindrome (35344644353).

The spelling of 33121332220 in words is "thirty-three billion, one hundred twenty-one million, three hundred thirty-two thousand, two hundred twenty".