210406121 has 2 divisors, whose sum is σ = 210406122. Its totient is φ = 210406120.

The previous prime is 210406109. The next prime is 210406211. The reversal of 210406121 is 121604012.

Together with next prime (210406211) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196981225 + 13424896 = 14035^2 + 3664^2 .

It is a cyclic number.

It is not a de Polignac number, because 210406121 - 2²⁶ = 143297257 is a prime.

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 210406121.

It is not a weakly prime, because it can be changed into another prime (210406321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105203060 + 105203061.

It is an arithmetic number, because the mean of its divisors is an integer number (105203061).

Almost surely, 2^210406121 is an apocalyptic number.

It is an amenable number.

210406121 is a deficient number, since it is larger than the sum of its proper divisors (1).

210406121 is an equidigital number, since it uses as much as digits as its factorization.

210406121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 210406121 is about 14505.3824837541. The cubic root of 210406121 is about 594.7751154471.

The spelling of 210406121 in words is "two hundred ten million, four hundred six thousand, one hundred twenty-one".