13121243042123 has 4 divisors (see below), whose sum is σ = 13121341545240. Its totient is φ = 13121144539008.

The previous prime is 13121243042111. The next prime is 13121243042129. The reversal of 13121243042123 is 32124034212131.

It is a happy number.

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 13121243042123 - 2¹⁴ = 13121243025739 is a prime.

It is a super-2 number, since 2×13121243042123² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13121243042129) 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, 49051478 + ... + 49318251.

It is an arithmetic number, because the mean of its divisors is an integer number (3280335386310).

Almost surely, 2^{13121243042123} is an apocalyptic number.

13121243042123 is a deficient number, since it is larger than the sum of its proper divisors (98503117).

13121243042123 is an equidigital number, since it uses as much as digits as its factorization.

13121243042123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98503116.

The product of its (nonzero) digits is 6912, while the sum is 29.

Adding to 13121243042123 its reverse (32124034212131), we get a palindrome (45245277254254).

The spelling of 13121243042123 in words is "thirteen trillion, one hundred twenty-one billion, two hundred forty-three million, forty-two thousand, one hundred twenty-three".