33121904 has 20 divisors (see below), whose sum is σ = 64263000. Its totient is φ = 16537920.

The previous prime is 33121901. The next prime is 33121927. The reversal of 33121904 is 40912133.

It is a self number, because there is not a number n which added to its sum of digits gives 33121904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33121901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21347 + ... + 22845.

It is an arithmetic number, because the mean of its divisors is an integer number (3213150).

Almost surely, 2^33121904 is an apocalyptic number.

It is an amenable number.

33121904 is a deficient number, since it is larger than the sum of its proper divisors (31141096).

33121904 is a wasteful number, since it uses less digits than its factorization.

33121904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2888 (or 2882 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 33121904 is about 5755.1632470331. The cubic root of 33121904 is about 321.1479085325.

The spelling of 33121904 in words is "thirty-three million, one hundred twenty-one thousand, nine hundred four".