213213349 has 2 divisors, whose sum is σ = 213213350. Its totient is φ = 213213348.

The previous prime is 213213347. The next prime is 213213367. The reversal of 213213349 is 943312312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 205005124 + 8208225 = 14318^2 + 2865^2 .

It is a cyclic number.

It is not a de Polignac number, because 213213349 - 2¹ = 213213347 is a prime.

Together with 213213347, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213213347) 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, 106606674 + 106606675.

It is an arithmetic number, because the mean of its divisors is an integer number (106606675).

Almost surely, 2^213213349 is an apocalyptic number.

It is an amenable number.

213213349 is a deficient number, since it is larger than the sum of its proper divisors (1).

213213349 is an equidigital number, since it uses as much as digits as its factorization.

213213349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 28.

The square root of 213213349 is about 14601.8269062470. The cubic root of 213213349 is about 597.4085913748.

The spelling of 213213349 in words is "two hundred thirteen million, two hundred thirteen thousand, three hundred forty-nine".