210961 has 2 divisors, whose sum is σ = 210962. Its totient is φ = 210960.

The previous prime is 210943. The next prime is 210967. The reversal of 210961 is 169012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 207936 + 3025 = 456^2 + 55^2 .

It is a cyclic number.

It is not a de Polignac number, because 210961 - 2⁵ = 210929 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (210967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105480 + 105481.

It is an arithmetic number, because the mean of its divisors is an integer number (105481).

2²¹⁰⁹⁶¹ is an apocalyptic number.

It is an amenable number.

210961 is a deficient number, since it is larger than the sum of its proper divisors (1).

210961 is an equidigital number, since it uses as much as digits as its factorization.

210961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 210961 is about 459.3049096189. The cubic root of 210961 is about 59.5297499697.

Adding to 210961 its reverse (169012), we get a palindrome (379973).

The spelling of 210961 in words is "two hundred ten thousand, nine hundred sixty-one".