121544445121 has 16 divisors (see below), whose sum is σ = 139736399040. Its totient is φ = 104556553920.

The previous prime is 121544445091. The next prime is 121544445133.

121544445121 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 121544445121 - 2¹³ = 121544436929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121544445181) 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, 162610 + ... + 519163.

It is an arithmetic number, because the mean of its divisors is an integer number (8733524940).

Almost surely, 2^121544445121 is an apocalyptic number.

121544445121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121544445121 is a deficient number, since it is larger than the sum of its proper divisors (18191953919).

121544445121 is a wasteful number, since it uses less digits than its factorization.

121544445121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682656.

The product of its digits is 25600, while the sum is 34.

It can be divided in two parts, 121544 and 445121, that added together give a palindrome (566665).

The spelling of 121544445121 in words is "one hundred twenty-one billion, five hundred forty-four million, four hundred forty-five thousand, one hundred twenty-one".