210121103 has 2 divisors, whose sum is σ = 210121104. Its totient is φ = 210121102.

The previous prime is 210121063. The next prime is 210121151. The reversal of 210121103 is 301121012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 210121103 - 2¹² = 210117007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210129103) 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, 105060551 + 105060552.

It is an arithmetic number, because the mean of its divisors is an integer number (105060552).

Almost surely, 2^210121103 is an apocalyptic number.

210121103 is a deficient number, since it is larger than the sum of its proper divisors (1).

210121103 is an equidigital number, since it uses as much as digits as its factorization.

210121103 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 210121103 is about 14495.5545944265. The cubic root of 210121103 is about 594.5064315389.

Adding to 210121103 its reverse (301121012), we get a palindrome (511242115).

Subtracting 210121103 from its reverse (301121012), we obtain a palindrome (90999909).

The spelling of 210121103 in words is "two hundred ten million, one hundred twenty-one thousand, one hundred three".