121405432345441 has 4 divisors (see below), whose sum is σ = 121408589954500. Its totient is φ = 121402274736384.

The previous prime is 121405432345411. The next prime is 121405432345447. The reversal of 121405432345441 is 144543234504121.

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 55196355830625 + 66209076514816 = 7429425^2 + 8136896^2 .

It is a cyclic number.

It is not a de Polignac number, because 121405432345441 - 2²⁵ = 121405398791009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121405432345447) 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, 1578746856 + ... + 1578823753.

It is an arithmetic number, because the mean of its divisors is an integer number (30352147488625).

Almost surely, 2^{121405432345441} is an apocalyptic number.

It is an amenable number.

121405432345441 is a deficient number, since it is larger than the sum of its proper divisors (3157609059).

121405432345441 is an equidigital number, since it uses as much as digits as its factorization.

121405432345441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3157609058.

The product of its (nonzero) digits is 921600, while the sum is 43.

Adding to 121405432345441 its reverse (144543234504121), we get a palindrome (265948666849562).

The spelling of 121405432345441 in words is "one hundred twenty-one trillion, four hundred five billion, four hundred thirty-two million, three hundred forty-five thousand, four hundred forty-one".