33121556020 has 48 divisors (see below), whose sum is σ = 79891257600. Its totient is φ = 11298887424.

The previous prime is 33121555997. The next prime is 33121556051. The reversal of 33121556020 is 2065512133.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 33121556020.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 566569 + ... + 622288.

It is an arithmetic number, because the mean of its divisors is an integer number (1664401200).

Almost surely, 2^33121556020 is an apocalyptic number.

It is an amenable number.

33121556020 is an abundant number, since it is smaller than the sum of its proper divisors (46769701580).

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

33121556020 is a wasteful number, since it uses less digits than its factorization.

33121556020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1189072 (or 1189070 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 28.

The spelling of 33121556020 in words is "thirty-three billion, one hundred twenty-one million, five hundred fifty-six thousand, twenty".