33220212 has 12 divisors (see below), whose sum is σ = 77513856. Its totient is φ = 11073400.

The previous prime is 33220199. The next prime is 33220217. The reversal of 33220212 is 21202233.

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

It is a super-2 number, since 2×33220212² = 2207164970649888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 33220191 and 33220200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33220217) 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, 1384164 + ... + 1384187.

It is an arithmetic number, because the mean of its divisors is an integer number (6459488).

Almost surely, 2^33220212 is an apocalyptic number.

It is an amenable number.

33220212 is an abundant number, since it is smaller than the sum of its proper divisors (44293644).

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

33220212 is a wasteful number, since it uses less digits than its factorization.

33220212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2768358 (or 2768356 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 33220212 is about 5763.6977713964. The cubic root of 33220212 is about 321.4653241079.

Adding to 33220212 its reverse (21202233), we get a palindrome (54422445).

The spelling of 33220212 in words is "thirty-three million, two hundred twenty thousand, two hundred twelve".