33121220 has 24 divisors (see below), whose sum is σ = 75878208. Its totient is φ = 12044000.

The previous prime is 33121213. The next prime is 33121247. The reversal of 33121220 is 2212133.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 33121195 and 33121204.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75056 + ... + 75495.

It is an arithmetic number, because the mean of its divisors is an integer number (3161592).

Almost surely, 2^33121220 is an apocalyptic number.

It is an amenable number.

33121220 is an abundant number, since it is smaller than the sum of its proper divisors (42756988).

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

33121220 is a wasteful number, since it uses less digits than its factorization.

33121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150571 (or 150569 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 33121220 is about 5755.1038218263. The cubic root of 33121220 is about 321.1456978435.

Adding to 33121220 its reverse (2212133), we get a palindrome (35333353).

The spelling of 33121220 in words is "thirty-three million, one hundred twenty-one thousand, two hundred twenty".