33212220 has 48 divisors (see below), whose sum is σ = 98467488. Its totient is φ = 8335360.

The previous prime is 33212189. The next prime is 33212261. The reversal of 33212220 is 2221233.

It is a super-2 number, since 2×33212220² = 2206103114656800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 33212220.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15261 + ... + 17300.

It is an arithmetic number, because the mean of its divisors is an integer number (2051406).

Almost surely, 2^33212220 is an apocalyptic number.

33212220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

33212220 is an abundant number, since it is smaller than the sum of its proper divisors (65255268).

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

33212220 is a wasteful number, since it uses less digits than its factorization.

33212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32590 (or 32588 counting only the distinct ones).

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

The square root of 33212220 is about 5763.0044247771. The cubic root of 33212220 is about 321.4395430470.

Adding to 33212220 its reverse (2221233), we get a palindrome (35433453).

The spelling of 33212220 in words is "thirty-three million, two hundred twelve thousand, two hundred twenty".