213202261 has 2 divisors, whose sum is σ = 213202262. Its totient is φ = 213202260.

The previous prime is 213202247. The next prime is 213202271. The reversal of 213202261 is 162202312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208224900 + 4977361 = 14430^2 + 2231^2 .

It is a cyclic number.

It is not a de Polignac number, because 213202261 - 2⁹ = 213201749 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213202271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106601130 + 106601131.

It is an arithmetic number, because the mean of its divisors is an integer number (106601131).

Almost surely, 2^213202261 is an apocalyptic number.

It is an amenable number.

213202261 is a deficient number, since it is larger than the sum of its proper divisors (1).

213202261 is an equidigital number, since it uses as much as digits as its factorization.

213202261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 213202261 is about 14601.4472227927. The cubic root of 213202261 is about 597.3982352670.

Adding to 213202261 its reverse (162202312), we get a palindrome (375404573).

The spelling of 213202261 in words is "two hundred thirteen million, two hundred two thousand, two hundred sixty-one".