121100553155 has 8 divisors (see below), whose sum is σ = 145326068352. Its totient is φ = 96876839488.

The previous prime is 121100553149. The next prime is 121100553157. The reversal of 121100553155 is 551355001121.

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 121100553155 - 2²⁸ = 120832117699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121100553157) 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 7 ways as a sum of consecutive naturals, for example, 297794 + ... + 575223.

It is an arithmetic number, because the mean of its divisors is an integer number (18165758544).

Almost surely, 2^121100553155 is an apocalyptic number.

121100553155 is a deficient number, since it is larger than the sum of its proper divisors (24225515197).

121100553155 is an equidigital number, since it uses as much as digits as its factorization.

121100553155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900765.

The product of its (nonzero) digits is 3750, while the sum is 29.

Adding to 121100553155 its reverse (551355001121), we get a palindrome (672455554276).

The spelling of 121100553155 in words is "one hundred twenty-one billion, one hundred million, five hundred fifty-three thousand, one hundred fifty-five".