33121213 has 2 divisors, whose sum is σ = 33121214. Its totient is φ = 33121212.

The previous prime is 33121181. The next prime is 33121247. The reversal of 33121213 is 31212133.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19740249 + 13380964 = 4443^2 + 3658^2 .

It is a cyclic number.

It is not a de Polignac number, because 33121213 - 2⁵ = 33121181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33151213) by changing a digit.

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 as a sum of consecutive naturals, namely, 16560606 + 16560607.

It is an arithmetic number, because the mean of its divisors is an integer number (16560607).

Almost surely, 2^33121213 is an apocalyptic number.

It is an amenable number.

33121213 is a deficient number, since it is larger than the sum of its proper divisors (1).

33121213 is an equidigital number, since it uses as much as digits as its factorization.

33121213 is an odious number, because the sum of its binary digits is odd.

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

The square root of 33121213 is about 5755.1032136705. The cubic root of 33121213 is about 321.1456752193.

Adding to 33121213 its reverse (31212133), we get a palindrome (64333346).

It can be divided in two parts, 3 and 3121213, that multiplied together give a palindrome (9363639).

The spelling of 33121213 in words is "thirty-three million, one hundred twenty-one thousand, two hundred thirteen".