121240423313143 has 4 divisors (see below), whose sum is σ = 121240487926888. Its totient is φ = 121240358699400.

The previous prime is 121240423313077. The next prime is 121240423313147. The reversal of 121240423313143 is 341313324042121.

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 121240423313143 - 2³⁷ = 121102984359671 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121240423313099 and 121240423313108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121240423313147) 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, 29405433 + ... + 33274018.

It is an arithmetic number, because the mean of its divisors is an integer number (30310121981722).

Almost surely, 2^{121240423313143} is an apocalyptic number.

121240423313143 is a deficient number, since it is larger than the sum of its proper divisors (64613745).

121240423313143 is an equidigital number, since it uses as much as digits as its factorization.

121240423313143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64613744.

The product of its (nonzero) digits is 41472, while the sum is 34.

Adding to 121240423313143 its reverse (341313324042121), we get a palindrome (462553747355264).

The spelling of 121240423313143 in words is "one hundred twenty-one trillion, two hundred forty billion, four hundred twenty-three million, three hundred thirteen thousand, one hundred forty-three".