33221100 has 72 divisors (see below), whose sum is σ = 104868288. Its totient is φ = 8052800.

The previous prime is 33221093. The next prime is 33221137. The reversal of 33221100 is 112233.

It is a happy number.

It is a super-2 number, since 2×33221100² = 2207282970420000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1734 + ... + 8333.

It is an arithmetic number, because the mean of its divisors is an integer number (1456504).

Almost surely, 2^33221100 is an apocalyptic number.

33221100 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 33221100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52434144).

33221100 is an abundant number, since it is smaller than the sum of its proper divisors (71647188).

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

33221100 is a wasteful number, since it uses less digits than its factorization.

33221100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10095 (or 10088 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 33221100 is about 5763.7748047612. The cubic root of 33221100 is about 321.4681884150.

Adding to 33221100 its reverse (112233), we get a palindrome (33333333).

The spelling of 33221100 in words is "thirty-three million, two hundred twenty-one thousand, one hundred".