123203323021 has 4 divisors (see below), whose sum is σ = 127451713500. Its totient is φ = 118954932544.

The previous prime is 123203323003. The next prime is 123203323057. The reversal of 123203323021 is 120323302321.

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

It can be written as a sum of positive squares in 2 ways, for example, as 62003490025 + 61199832996 = 249005^2 + 247386^2 .

It is a cyclic number.

It is not a de Polignac number, because 123203323021 - 2²³ = 123194934413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123203322983 and 123203323001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123203323081) 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, 2124195196 + ... + 2124195253.

It is an arithmetic number, because the mean of its divisors is an integer number (31862928375).

Almost surely, 2^123203323021 is an apocalyptic number.

It is an amenable number.

123203323021 is a deficient number, since it is larger than the sum of its proper divisors (4248390479).

123203323021 is an equidigital number, since it uses as much as digits as its factorization.

123203323021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4248390478.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 123203323021 its reverse (120323302321), we get a palindrome (243526625342).

It can be divided in two parts, 123203 and 323021, that added together give a square (446224 = 668²).

The spelling of 123203323021 in words is "one hundred twenty-three billion, two hundred three million, three hundred twenty-three thousand, twenty-one".