12124242121 has 4 divisors (see below), whose sum is σ = 12837432852. Its totient is φ = 11411051392.

The previous prime is 12124241971. The next prime is 12124242127.

12124242121 is nontrivially palindromic in base 10.

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 8697427600 + 3426814521 = 93260^2 + 58539^2 .

It is a cyclic number.

It is not a de Polignac number, because 12124242121 - 2⁹ = 12124241609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12124242092 and 12124242101.

It is not an unprimeable number, because it can be changed into a prime (12124242127) 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, 356595340 + ... + 356595373.

It is an arithmetic number, because the mean of its divisors is an integer number (3209358213).

Almost surely, 2^12124242121 is an apocalyptic number.

It is an amenable number.

12124242121 is a deficient number, since it is larger than the sum of its proper divisors (713190731).

12124242121 is an equidigital number, since it uses as much as digits as its factorization.

12124242121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 713190730.

The product of its digits is 512, while the sum is 22.

The spelling of 12124242121 in words is "twelve billion, one hundred twenty-four million, two hundred forty-two thousand, one hundred twenty-one".