123121203203 has 4 divisors (see below), whose sum is σ = 124061059848. Its totient is φ = 122181346560.

The previous prime is 123121203187. The next prime is 123121203217. The reversal of 123121203203 is 302302121321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 302302121321 = 114833 ⋅2632537.

It is a cyclic number.

It is not a de Polignac number, because 123121203203 - 2⁴ = 123121203187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123121209203) 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, 469928126 + ... + 469928387.

It is an arithmetic number, because the mean of its divisors is an integer number (31015264962).

Almost surely, 2^123121203203 is an apocalyptic number.

123121203203 is a deficient number, since it is larger than the sum of its proper divisors (939856645).

123121203203 is an equidigital number, since it uses as much as digits as its factorization.

123121203203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939856644.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 123121203203 its reverse (302302121321), we get a palindrome (425423324524).

The spelling of 123121203203 in words is "one hundred twenty-three billion, one hundred twenty-one million, two hundred three thousand, two hundred three".