33121321 has 4 divisors (see below), whose sum is σ = 35069652. Its totient is φ = 31172992.

The previous prime is 33121307. The next prime is 33121331. The reversal of 33121321 is 12312133.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12312133 = 19 ⋅648007.

It can be written as a sum of positive squares in 2 ways, for example, as 25613721 + 7507600 = 5061^2 + 2740^2 .

It is a cyclic number.

It is not a de Polignac number, because 33121321 - 2²³ = 24732713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 33121295 and 33121304.

It is not an unprimeable number, because it can be changed into a prime (33121301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 974140 + ... + 974173.

It is an arithmetic number, because the mean of its divisors is an integer number (8767413).

Almost surely, 2^33121321 is an apocalyptic number.

It is an amenable number.

33121321 is a deficient number, since it is larger than the sum of its proper divisors (1948331).

33121321 is a wasteful number, since it uses less digits than its factorization.

33121321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1948330.

The product of its digits is 108, while the sum is 16.

The square root of 33121321 is about 5755.1125966396. The cubic root of 33121321 is about 321.1460242776.

Adding to 33121321 its reverse (12312133), we get a palindrome (45433454).

It can be divided in two parts, 3312132 and 1, that added together give a palindrome (3312133).

The spelling of 33121321 in words is "thirty-three million, one hundred twenty-one thousand, three hundred twenty-one".