121553355121 has 8 divisors (see below), whose sum is σ = 132622572384. Its totient is φ = 110487289920.

The previous prime is 121553355097. The next prime is 121553355149.

It is a happy number.

121553355121 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 121553355121 - 2¹¹ = 121553353073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121553353121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 707016 + ... + 861961.

It is an arithmetic number, because the mean of its divisors is an integer number (16577821548).

Almost surely, 2^121553355121 is an apocalyptic number.

121553355121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121553355121 is a deficient number, since it is larger than the sum of its proper divisors (11069217263).

121553355121 is a wasteful number, since it uses less digits than its factorization.

121553355121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1576031.

The product of its digits is 22500, while the sum is 34.

It can be divided in two parts, 121553 and 355121, that added together give a palindrome (476674).

The spelling of 121553355121 in words is "one hundred twenty-one billion, five hundred fifty-three million, three hundred fifty-five thousand, one hundred twenty-one".