33121420240 has 40 divisors (see below), whose sum is σ = 79088587560. Its totient is φ = 12890497536.

The previous prime is 33121420237. The next prime is 33121420291. The reversal of 33121420240 is 4202412133.

It can be written as a sum of positive squares in 4 ways, for example, as 4986054544 + 28135365696 = 70612^2 + 167736^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5591875 + ... + 5597794.

It is an arithmetic number, because the mean of its divisors is an integer number (1977214689).

Almost surely, 2^33121420240 is an apocalyptic number.

It is an amenable number.

33121420240 is an abundant number, since it is smaller than the sum of its proper divisors (45967167320).

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

33121420240 is a wasteful number, since it uses less digits than its factorization.

33121420240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11189719 (or 11189713 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 33121420240 its reverse (4202412133), we get a palindrome (37323832373).

The spelling of 33121420240 in words is "thirty-three billion, one hundred twenty-one million, four hundred twenty thousand, two hundred forty".