210343121 has 2 divisors, whose sum is σ = 210343122. Its totient is φ = 210343120.

The previous prime is 210343117. The next prime is 210343123. The reversal of 210343121 is 121343012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197093521 + 13249600 = 14039^2 + 3640^2 .

It is a cyclic number.

It is not a de Polignac number, because 210343121 - 2² = 210343117 is a prime.

Together with 210343123, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210343121.

It is not a weakly prime, because it can be changed into another prime (210343123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105171560 + 105171561.

It is an arithmetic number, because the mean of its divisors is an integer number (105171561).

Almost surely, 2^210343121 is an apocalyptic number.

It is an amenable number.

210343121 is a deficient number, since it is larger than the sum of its proper divisors (1).

210343121 is an equidigital number, since it uses as much as digits as its factorization.

210343121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 210343121 is about 14503.2107134938. The cubic root of 210343121 is about 594.7157468118.

Adding to 210343121 its reverse (121343012), we get a palindrome (331686133).

The spelling of 210343121 in words is "two hundred ten million, three hundred forty-three thousand, one hundred twenty-one".