213322261 has 2 divisors, whose sum is σ = 213322262. Its totient is φ = 213322260.

The previous prime is 213322247. The next prime is 213322313. The reversal of 213322261 is 162223312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170824900 + 42497361 = 13070^2 + 6519^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213322261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213322211) 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, 106661130 + 106661131.

It is an arithmetic number, because the mean of its divisors is an integer number (106661131).

Almost surely, 2^213322261 is an apocalyptic number.

It is an amenable number.

213322261 is a deficient number, since it is larger than the sum of its proper divisors (1).

213322261 is an equidigital number, since it uses as much as digits as its factorization.

213322261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 22.

The square root of 213322261 is about 14605.5558264655. Note that the first 3 decimals coincide. The cubic root of 213322261 is about 597.5102952773.

Adding to 213322261 its reverse (162223312), we get a palindrome (375545573).

The spelling of 213322261 in words is "two hundred thirteen million, three hundred twenty-two thousand, two hundred sixty-one".