1243242112123 has 8 divisors (see below), whose sum is σ = 1366021419840. Its totient is φ = 1122089020680.

The previous prime is 1243242112109. The next prime is 1243242112241. The reversal of 1243242112123 is 3212112423421.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1243242112123 is a prime.

It is a super-4 number, since 4×1243242112123⁴ (a number of 49 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1243242112091 and 1243242112100.

It is not an unprimeable number, because it can be changed into a prime (1243242112523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 406552465 + ... + 406555522.

It is an arithmetic number, because the mean of its divisors is an integer number (170752677480).

Almost surely, 2^{1243242112123} is an apocalyptic number.

1243242112123 is a deficient number, since it is larger than the sum of its proper divisors (122779307717).

1243242112123 is a wasteful number, since it uses less digits than its factorization.

1243242112123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813108137.

The product of its digits is 4608, while the sum is 28.

Adding to 1243242112123 its reverse (3212112423421), we get a palindrome (4455354535544).

The spelling of 1243242112123 in words is "one trillion, two hundred forty-three billion, two hundred forty-two million, one hundred twelve thousand, one hundred twenty-three".