123121203 has 4 divisors (see below), whose sum is σ = 164161608. Its totient is φ = 82080800.

The previous prime is 123121189. The next prime is 123121217. The reversal of 123121203 is 302121321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 302121321 = 3 ⋅100707107.

It is an interprime number because it is at equal distance from previous prime (123121189) and next prime (123121217).

It is a cyclic number.

It is not a de Polignac number, because 123121203 - 2⁹ = 123120691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123121253) 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, 20520198 + ... + 20520203.

It is an arithmetic number, because the mean of its divisors is an integer number (41040402).

Almost surely, 2^123121203 is an apocalyptic number.

123121203 is a deficient number, since it is larger than the sum of its proper divisors (41040405).

123121203 is an equidigital number, since it uses as much as digits as its factorization.

123121203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41040404.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 123121203 is about 11095.9994142033. Note that the first 3 decimals coincide. The cubic root of 123121203 is about 497.4822807928.

Adding to 123121203 its reverse (302121321), we get a palindrome (425242524).

The spelling of 123121203 in words is "one hundred twenty-three million, one hundred twenty-one thousand, two hundred three".