33121212 has 12 divisors (see below), whose sum is σ = 77282856. Its totient is φ = 11040400.

The previous prime is 33121181. The next prime is 33121213. The reversal of 33121212 is 21212133.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 33121191 and 33121200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33121213) 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, 1380039 + ... + 1380062.

It is an arithmetic number, because the mean of its divisors is an integer number (6440238).

Almost surely, 2^33121212 is an apocalyptic number.

It is an amenable number.

33121212 is an abundant number, since it is smaller than the sum of its proper divisors (44161644).

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

33121212 is a wasteful number, since it uses less digits than its factorization.

33121212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2760108 (or 2760106 counting only the distinct ones).

The product of its digits is 72, while the sum is 15.

The square root of 33121212 is about 5755.1031267910. The cubic root of 33121212 is about 321.1456719873.

Adding to 33121212 its reverse (21212133), we get a palindrome (54333345).

It can be divided in two parts, 33121 and 212, that added together give a palindrome (33333).

The spelling of 33121212 in words is "thirty-three million, one hundred twenty-one thousand, two hundred twelve".