210102121 has 2 divisors, whose sum is σ = 210102122. Its totient is φ = 210102120.

The previous prime is 210102089. The next prime is 210102149. The reversal of 210102121 is 121201012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197711721 + 12390400 = 14061^2 + 3520^2 .

It is a cyclic number.

It is not a de Polignac number, because 210102121 - 2⁵ = 210102089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210102098 and 210102107.

It is not a weakly prime, because it can be changed into another prime (210102421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105051060 + 105051061.

It is an arithmetic number, because the mean of its divisors is an integer number (105051061).

Almost surely, 2^210102121 is an apocalyptic number.

It is an amenable number.

210102121 is a deficient number, since it is larger than the sum of its proper divisors (1).

210102121 is an equidigital number, since it uses as much as digits as its factorization.

210102121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 210102121 is about 14494.8998271806. The cubic root of 210102121 is about 594.4885287505.

Adding to 210102121 its reverse (121201012), we get a palindrome (331303133).

The spelling of 210102121 in words is "two hundred ten million, one hundred two thousand, one hundred twenty-one".