33121866840 has 32 divisors (see below), whose sum is σ = 99365600880. Its totient is φ = 8832497792.

The previous prime is 33121866797. The next prime is 33121866847. The reversal of 33121866840 is 4866812133.

It is a junction number, because it is equal to n+sod(n) for n = 33121866792 and 33121866801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33121866847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138007659 + ... + 138007898.

Almost surely, 2^33121866840 is an apocalyptic number.

33121866840 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

33121866840 is an abundant number, since it is smaller than the sum of its proper divisors (66243734040).

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

33121866840 is a wasteful number, since it uses less digits than its factorization.

33121866840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276015571 (or 276015567 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The spelling of 33121866840 in words is "thirty-three billion, one hundred twenty-one million, eight hundred sixty-six thousand, eight hundred forty".