210121200323 has 4 divisors (see below), whose sum is σ = 210122415960. Its totient is φ = 210119984688.

The previous prime is 210121200271. The next prime is 210121200329. The reversal of 210121200323 is 323002121012.

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

It is a cyclic number.

It is not a de Polignac number, because 210121200323 - 2²⁴ = 210104423107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210121200329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 294818 + ... + 712151.

It is an arithmetic number, because the mean of its divisors is an integer number (52530603990).

Almost surely, 2^210121200323 is an apocalyptic number.

210121200323 is a deficient number, since it is larger than the sum of its proper divisors (1215637).

210121200323 is a wasteful number, since it uses less digits than its factorization.

210121200323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1215636.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 210121200323 its reverse (323002121012), we get a palindrome (533123321335).

The spelling of 210121200323 in words is "two hundred ten billion, one hundred twenty-one million, two hundred thousand, three hundred twenty-three".