33121021212 has 18 divisors (see below), whose sum is σ = 83722581488. Its totient is φ = 11040340392.

The previous prime is 33121021189. The next prime is 33121021253. The reversal of 33121021212 is 21212012133.

33121021212 is a `hidden beast` number, since 331 + 210 + 2 + 121 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×33121021212² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 5 ways as a sum of consecutive naturals, for example, 460014148 + ... + 460014219.

Almost surely, 2^33121021212 is an apocalyptic number.

It is an amenable number.

33121021212 is an abundant number, since it is smaller than the sum of its proper divisors (50601560276).

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

33121021212 is a wasteful number, since it uses less digits than its factorization.

33121021212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920028377 (or 920028372 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 33121021212 its reverse (21212012133), we get a palindrome (54333033345).

The spelling of 33121021212 in words is "thirty-three billion, one hundred twenty-one million, twenty-one thousand, two hundred twelve".