121240344243143 has 24 divisors (see below), whose sum is σ = 133004368932864. Its totient is φ = 110379334435200.

The previous prime is 121240344243131. The next prime is 121240344243169. The reversal of 121240344243143 is 341342443042121.

It is not a de Polignac number, because 121240344243143 - 2⁴ = 121240344243127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121240344243097 and 121240344243106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121240344243943) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17530598 + ... + 23447868.

It is an arithmetic number, because the mean of its divisors is an integer number (5541848705536).

Almost surely, 2^{121240344243143} is an apocalyptic number.

121240344243143 is a deficient number, since it is larger than the sum of its proper divisors (11764024689721).

121240344243143 is a wasteful number, since it uses less digits than its factorization.

121240344243143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5919623 (or 5919606 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 38.

Adding to 121240344243143 its reverse (341342443042121), we get a palindrome (462582787285264).

The spelling of 121240344243143 in words is "one hundred twenty-one trillion, two hundred forty billion, three hundred forty-four million, two hundred forty-three thousand, one hundred forty-three".