123203121313 has 4 divisors (see below), whose sum is σ = 123731890308. Its totient is φ = 122674352320.

The previous prime is 123203121269. The next prime is 123203121331. The reversal of 123203121313 is 313121302321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 313121302321 = 12487 ⋅25075783.

It can be written as a sum of positive squares in 2 ways, for example, as 72896220049 + 50306901264 = 269993^2 + 224292^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123203121313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123203161313) 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, 264384148 + ... + 264384613.

It is an arithmetic number, because the mean of its divisors is an integer number (30932972577).

Almost surely, 2^123203121313 is an apocalyptic number.

It is an amenable number.

123203121313 is a deficient number, since it is larger than the sum of its proper divisors (528768995).

123203121313 is an equidigital number, since it uses as much as digits as its factorization.

123203121313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528768994.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 123203121313 its reverse (313121302321), we get a palindrome (436324423634).

The spelling of 123203121313 in words is "one hundred twenty-three billion, two hundred three million, one hundred twenty-one thousand, three hundred thirteen".