121443134421 has 16 divisors (see below), whose sum is σ = 185216741504. Its totient is φ = 69335875584.

The previous prime is 121443134387. The next prime is 121443134437. The reversal of 121443134421 is 124431344121.

It is a happy number.

It is not a de Polignac number, because 121443134421 - 2¹⁷ = 121443003349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121443134441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2483596 + ... + 2532021.

It is an arithmetic number, because the mean of its divisors is an integer number (11576046344).

Almost surely, 2^121443134421 is an apocalyptic number.

It is an amenable number.

121443134421 is a deficient number, since it is larger than the sum of its proper divisors (63773607083).

121443134421 is a wasteful number, since it uses less digits than its factorization.

121443134421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5016780.

The product of its digits is 9216, while the sum is 30.

Adding to 121443134421 its reverse (124431344121), we get a palindrome (245874478542).

The spelling of 121443134421 in words is "one hundred twenty-one billion, four hundred forty-three million, one hundred thirty-four thousand, four hundred twenty-one".