33311221540 has 96 divisors (see below), whose sum is σ = 77458913280. Its totient is φ = 11969058816.

The previous prime is 33311221513. The next prime is 33311221543. The reversal of 33311221540 is 4512211333.

It is a happy number.

It is a super-2 number, since 2×33311221540² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (33311221543) 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, 3741334 + ... + 3750226.

It is an arithmetic number, because the mean of its divisors is an integer number (806863680).

Almost surely, 2^33311221540 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 33311221540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38729456640).

33311221540 is an abundant number, since it is smaller than the sum of its proper divisors (44147691740).

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

33311221540 is a wasteful number, since it uses less digits than its factorization.

33311221540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9421 (or 9419 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

Adding to 33311221540 its reverse (4512211333), we get a palindrome (37823432873).

The spelling of 33311221540 in words is "thirty-three billion, three hundred eleven million, two hundred twenty-one thousand, five hundred forty".