33121331012 has 96 divisors (see below), whose sum is σ = 76742830080. Its totient is φ = 12116805120.

The previous prime is 33121331011. The next prime is 33121331017. The reversal of 33121331012 is 21013312133.

It is not an unprimeable number, because it can be changed into a prime (33121331011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 636233 + ... + 686319.

It is an arithmetic number, because the mean of its divisors is an integer number (799404480).

Almost surely, 2^33121331012 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 33121331012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38371415040).

33121331012 is an abundant number, since it is smaller than the sum of its proper divisors (43621499068).

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

33121331012 is a wasteful number, since it uses less digits than its factorization.

33121331012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50241 (or 50239 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 33121331012 its reverse (21013312133), we get a palindrome (54134643145).

The spelling of 33121331012 in words is "thirty-three billion, one hundred twenty-one million, three hundred thirty-one thousand, twelve".