210232312121 has 16 divisors (see below), whose sum is σ = 228050729424. Its totient is φ = 192652472064.

The previous prime is 210232312111. The next prime is 210232312123. The reversal of 210232312121 is 121213232012.

It can be written as a sum of positive squares in 8 ways, for example, as 526932025 + 209705380096 = 22955^2 + 457936^2 .

It is not a de Polignac number, because 210232312121 - 2⁶ = 210232312057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210232312093 and 210232312102.

It is not an unprimeable number, because it can be changed into a prime (210232312123) 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 15 ways as a sum of consecutive naturals, for example, 1453535 + ... + 1591611.

It is an arithmetic number, because the mean of its divisors is an integer number (14253170589).

Almost surely, 2^210232312121 is an apocalyptic number.

It is an amenable number.

210232312121 is a deficient number, since it is larger than the sum of its proper divisors (17818417303).

210232312121 is a wasteful number, since it uses less digits than its factorization.

210232312121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138940.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 210232312121 its reverse (121213232012), we get a palindrome (331445544133).

The spelling of 210232312121 in words is "two hundred ten billion, two hundred thirty-two million, three hundred twelve thousand, one hundred twenty-one".