210401 has 2 divisors, whose sum is σ = 210402. Its totient is φ = 210400.

The previous prime is 210391. The next prime is 210403. The reversal of 210401 is 104012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 179776 + 30625 = 424^2 + 175^2 .

It is a cyclic number.

It is not a de Polignac number, because 210401 - 2¹⁴ = 194017 is a prime.

It is a super-3 number, since 3×210401³ = 27942461007333603, which contains 333 as substring.

It is a Sophie Germain prime.

Together with 210403, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (210403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105200 + 105201.

It is an arithmetic number, because the mean of its divisors is an integer number (105201).

2²¹⁰⁴⁰¹ is an apocalyptic number.

It is an amenable number.

210401 is a deficient number, since it is larger than the sum of its proper divisors (1).

210401 is an equidigital number, since it uses as much as digits as its factorization.

210401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 210401 is about 458.6948876977. The cubic root of 210401 is about 59.4770290068.

Adding to 210401 its reverse (104012), we get a palindrome (314413).

It can be divided in two parts, 2 and 10401, that multiplied together give a palindrome (20802).

The spelling of 210401 in words is "two hundred ten thousand, four hundred one", and thus it is an iban number.