210930121 has 4 divisors (see below), whose sum is σ = 211681044. Its totient is φ = 210179200.

The previous prime is 210930119. The next prime is 210930173. The reversal of 210930121 is 121039012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 76370121 + 134560000 = 8739^2 + 11600^2 .

It is a cyclic number.

It is not a de Polignac number, because 210930121 - 2¹ = 210930119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210930221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 375040 + ... + 375601.

It is an arithmetic number, because the mean of its divisors is an integer number (52920261).

Almost surely, 2^210930121 is an apocalyptic number.

It is an amenable number.

210930121 is a deficient number, since it is larger than the sum of its proper divisors (750923).

210930121 is an equidigital number, since it uses as much as digits as its factorization.

210930121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 750922.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 210930121 is about 14523.4335127751. The cubic root of 210930121 is about 595.2684531139.

Adding to 210930121 its reverse (121039012), we get a palindrome (331969133).

The spelling of 210930121 in words is "two hundred ten million, nine hundred thirty thousand, one hundred twenty-one".