13212161 has 2 divisors, whose sum is σ = 13212162. Its totient is φ = 13212160.

The previous prime is 13212151. The next prime is 13212167. The reversal of 13212161 is 16121231.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9859600 + 3352561 = 3140^2 + 1831^2 .

It is a cyclic number.

It is not a de Polignac number, because 13212161 - 2¹⁸ = 12950017 is a prime.

It is a super-2 number, since 2×13212161² = 349122396579842, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (13212167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6606080 + 6606081.

It is an arithmetic number, because the mean of its divisors is an integer number (6606081).

Almost surely, 2^13212161 is an apocalyptic number.

It is an amenable number.

13212161 is a deficient number, since it is larger than the sum of its proper divisors (1).

13212161 is an equidigital number, since it uses as much as digits as its factorization.

13212161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 17.

The square root of 13212161 is about 3634.8536421705. The cubic root of 13212161 is about 236.4057047723.

Adding to 13212161 its reverse (16121231), we get a palindrome (29333392).

The spelling of 13212161 in words is "thirteen million, two hundred twelve thousand, one hundred sixty-one".