33121890 has 24 divisors (see below), whose sum is σ = 86117148. Its totient is φ = 8832480.

The previous prime is 33121867. The next prime is 33121901. The reversal of 33121890 is 9812133.

It can be written as a sum of positive squares in 2 ways, for example, as 32182929 + 938961 = 5673^2 + 969^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 183921 + ... + 184100.

Almost surely, 2^33121890 is an apocalyptic number.

33121890 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

33121890 is an abundant number, since it is smaller than the sum of its proper divisors (52995258).

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

33121890 is a wasteful number, since it uses less digits than its factorization.

33121890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368034 (or 368031 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 33121890 is about 5755.1620307338. The cubic root of 33121890 is about 321.1478632847.

The spelling of 33121890 in words is "thirty-three million, one hundred twenty-one thousand, eight hundred ninety".