33100221 has 16 divisors (see below), whose sum is σ = 55024128. Its totient is φ = 17194800.

The previous prime is 33100187. The next prime is 33100253. The reversal of 33100221 is 12200133.

It is a happy number.

33100221 is nontrivially palindromic in base 4.

It is not a de Polignac number, because 33100221 - 2⁹ = 33099709 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 33100197 and 33100206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33100021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71415 + ... + 71876.

It is an arithmetic number, because the mean of its divisors is an integer number (3439008).

Almost surely, 2^33100221 is an apocalyptic number.

It is an amenable number.

33100221 is a deficient number, since it is larger than the sum of its proper divisors (21923907).

33100221 is a wasteful number, since it uses less digits than its factorization.

33100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143312.

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

The square root of 33100221 is about 5753.2791519272. The cubic root of 33100221 is about 321.0778142309.

Adding to 33100221 its reverse (12200133), we get a palindrome (45300354).

The spelling of 33100221 in words is "thirty-three million, one hundred thousand, two hundred twenty-one".