33331213 has 2 divisors, whose sum is σ = 33331214. Its totient is φ = 33331212.

The previous prime is 33331201. The next prime is 33331217. The reversal of 33331213 is 31213333.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27071209 + 6260004 = 5203^2 + 2502^2 .

It is a cyclic number.

It is not a de Polignac number, because 33331213 - 2²¹ = 31234061 is a prime.

It is a super-2 number, since 2×33331213² = 2221939520102738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33331217) 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 as a sum of consecutive naturals, namely, 16665606 + 16665607.

It is an arithmetic number, because the mean of its divisors is an integer number (16665607).

Almost surely, 2^33331213 is an apocalyptic number.

It is an amenable number.

33331213 is a deficient number, since it is larger than the sum of its proper divisors (1).

33331213 is an equidigital number, since it uses as much as digits as its factorization.

33331213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 486, while the sum is 19.

The square root of 33331213 is about 5773.3190627229. The cubic root of 33331213 is about 321.8229708594.

Adding to 33331213 its reverse (31213333), we get a palindrome (64544546).

The spelling of 33331213 in words is "thirty-three million, three hundred thirty-one thousand, two hundred thirteen".