210315121 has 2 divisors, whose sum is σ = 210315122. Its totient is φ = 210315120.

The previous prime is 210315097. The next prime is 210315137. The reversal of 210315121 is 121513012.

It is an a-pointer prime, because the next prime (210315137) can be obtained adding 210315121 to its sum of digits (16).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163200625 + 47114496 = 12775^2 + 6864^2 .

It is a cyclic number.

It is not a de Polignac number, because 210315121 - 2²³ = 201926513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210315095 and 210315104.

It is not a weakly prime, because it can be changed into another prime (210315421) 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, 105157560 + 105157561.

It is an arithmetic number, because the mean of its divisors is an integer number (105157561).

Almost surely, 2^210315121 is an apocalyptic number.

It is an amenable number.

210315121 is a deficient number, since it is larger than the sum of its proper divisors (1).

210315121 is an equidigital number, since it uses as much as digits as its factorization.

210315121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 210315121 is about 14502.2453778717. The cubic root of 210315121 is about 594.6893569466.

Adding to 210315121 its reverse (121513012), we get a palindrome (331828133).

The spelling of 210315121 in words is "two hundred ten million, three hundred fifteen thousand, one hundred twenty-one".