33211231221 has 16 divisors (see below), whose sum is σ = 51640400000. Its totient is φ = 18977845824.

The previous prime is 33211231169. The next prime is 33211231237. The reversal of 33211231221 is 12213211233.

It is not a de Polignac number, because 33211231221 - 2¹⁰ = 33211230197 is a prime.

It is a super-2 number, since 2×33211231221² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (33211231721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16136596 + ... + 16138653.

It is an arithmetic number, because the mean of its divisors is an integer number (3227525000).

Almost surely, 2^33211231221 is an apocalyptic number.

It is an amenable number.

33211231221 is a deficient number, since it is larger than the sum of its proper divisors (18429168779).

33211231221 is an equidigital number, since it uses as much as digits as its factorization.

33211231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32275273 (or 32275259 counting only the distinct ones).

The product of its digits is 432, while the sum is 21.

Adding to 33211231221 its reverse (12213211233), we get a palindrome (45424442454).

The spelling of 33211231221 in words is "thirty-three billion, two hundred eleven million, two hundred thirty-one thousand, two hundred twenty-one".