123204204020243 has 4 divisors (see below), whose sum is σ = 123204343325400. Its totient is φ = 123204064715088.

The previous prime is 123204204020213. The next prime is 123204204020257. The reversal of 123204204020243 is 342020402402321.

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

It is a cyclic number.

It is not a de Polignac number, because 123204204020243 - 2¹⁸ = 123204203758099 is a prime.

It is a super-2 number, since 2×123204204020243² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123204204020213) 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, 68317418 + ... + 70097631.

It is an arithmetic number, because the mean of its divisors is an integer number (30801085831350).

Almost surely, 2^{123204204020243} is an apocalyptic number.

123204204020243 is a deficient number, since it is larger than the sum of its proper divisors (139305157).

123204204020243 is an equidigital number, since it uses as much as digits as its factorization.

123204204020243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139305156.

The product of its (nonzero) digits is 18432, while the sum is 29.

Adding to 123204204020243 its reverse (342020402402321), we get a palindrome (465224606422564).

The spelling of 123204204020243 in words is "one hundred twenty-three trillion, two hundred four billion, two hundred four million, twenty thousand, two hundred forty-three".