121421341555 has 4 divisors (see below), whose sum is σ = 145705609872. Its totient is φ = 97137073240.

The previous prime is 121421341487. The next prime is 121421341579. The reversal of 121421341555 is 555143124121.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 121421341555 - 2¹⁵ = 121421308787 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121421341555.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12142134151 + ... + 12142134160.

It is an arithmetic number, because the mean of its divisors is an integer number (36426402468).

Almost surely, 2^121421341555 is an apocalyptic number.

121421341555 is a deficient number, since it is larger than the sum of its proper divisors (24284268317).

121421341555 is an equidigital number, since it uses as much as digits as its factorization.

121421341555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24284268316.

The product of its digits is 24000, while the sum is 34.

Adding to 121421341555 its reverse (555143124121), we get a palindrome (676564465676).

The spelling of 121421341555 in words is "one hundred twenty-one billion, four hundred twenty-one million, three hundred forty-one thousand, five hundred fifty-five".