123121121441 has 4 divisors (see below), whose sum is σ = 123129667584.
Its totient is φ = 123112575300.
The previous prime is 123121121341. The next prime is 123121121447. The reversal of 123121121441 is 144121121321.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is a cyclic number.
It is not a de Polignac number, because 123121121441 - 214 = 123121105057 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (123121121447) 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, 4251425 + ... + 4280286.
It is an arithmetic number, because the mean of its divisors is an integer number (30782416896).
Almost surely, 2123121121441 is an apocalyptic number.
It is an amenable number.
123121121441 is a deficient number, since it is larger than the sum of its proper divisors (8546143).
123121121441 is an equidigital number, since it uses as much as digits as its factorization.
123121121441 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 8546142.
The product of its digits is 384, while the sum is 23.
Adding to 123121121441 its reverse (144121121321), we get a palindrome (267242242762).
The spelling of 123121121441 in words is "one hundred twenty-three billion, one hundred twenty-one million, one hundred twenty-one thousand, four hundred forty-one".