121355402343241 has 16 divisors (see below), whose sum is σ = 133720783979328. Its totient is φ = 109214560537600.

The previous prime is 121355402343199. The next prime is 121355402343247. The reversal of 121355402343241 is 142343204553121.

It is a cyclic number.

It is not a de Polignac number, because 121355402343241 - 2³⁹ = 120805646529353 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121355402343194 and 121355402343203.

It is not an unprimeable number, because it can be changed into a prime (121355402343247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57999280 + ... + 60055201.

It is an arithmetic number, because the mean of its divisors is an integer number (8357548998708).

Almost surely, 2^{121355402343241} is an apocalyptic number.

121355402343241 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121355402343241 is a deficient number, since it is larger than the sum of its proper divisors (12365381636087).

121355402343241 is a wasteful number, since it uses less digits than its factorization.

121355402343241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118055432.

The product of its (nonzero) digits is 345600, while the sum is 40.

Adding to 121355402343241 its reverse (142343204553121), we get a palindrome (263698606896362).

The spelling of 121355402343241 in words is "one hundred twenty-one trillion, three hundred fifty-five billion, four hundred two million, three hundred forty-three thousand, two hundred forty-one".