210123203121 has 24 divisors (see below), whose sum is σ = 327409618536. Its totient is φ = 129088488960.

The previous prime is 210123203111. The next prime is 210123203153. The reversal of 210123203121 is 121302321012.

210123203121 is a `hidden beast` number, since 21 + 0 + 12 + 320 + 312 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 20467308096 + 189655895025 = 143064^2 + 435495^2 .

It is not a de Polignac number, because 210123203121 - 2⁹ = 210123202609 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210123203094 and 210123203103.

It is not an unprimeable number, because it can be changed into a prime (210123203111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1444890 + ... + 1583651.

It is an arithmetic number, because the mean of its divisors is an integer number (13642067439).

Almost surely, 2^210123203121 is an apocalyptic number.

It is an amenable number.

210123203121 is a deficient number, since it is larger than the sum of its proper divisors (117286415415).

210123203121 is a wasteful number, since it uses less digits than its factorization.

210123203121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3029153 (or 3029150 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 210123203121 its reverse (121302321012), we get a palindrome (331425524133).

The spelling of 210123203121 in words is "two hundred ten billion, one hundred twenty-three million, two hundred three thousand, one hundred twenty-one".