33212121220 has 24 divisors (see below), whose sum is σ = 73416268800. Its totient is φ = 12585645792.

The previous prime is 33212121203. The next prime is 33212121221. The reversal of 33212121220 is 2212121233.

It is a super-2 number, since 2×33212121220² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (33212121221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43699780 + ... + 43700539.

It is an arithmetic number, because the mean of its divisors is an integer number (3059011200).

Almost surely, 2^33212121220 is an apocalyptic number.

It is an amenable number.

33212121220 is an abundant number, since it is smaller than the sum of its proper divisors (40204147580).

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

33212121220 is a wasteful number, since it uses less digits than its factorization.

33212121220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87400347 (or 87400345 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 33212121220 its reverse (2212121233), we get a palindrome (35424242453).

The spelling of 33212121220 in words is "thirty-three billion, two hundred twelve million, one hundred twenty-one thousand, two hundred twenty".