121553144401 has 4 divisors (see below), whose sum is σ = 130903386292. Its totient is φ = 112202902512.

The previous prime is 121553144387. The next prime is 121553144407. The reversal of 121553144401 is 104441355121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27564300625 + 93988843776 = 166025^2 + 306576^2 .

It is a cyclic number.

It is not a de Polignac number, because 121553144401 - 2⁵ = 121553144369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121553144407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4675120926 + ... + 4675120951.

It is an arithmetic number, because the mean of its divisors is an integer number (32725846573).

Almost surely, 2^121553144401 is an apocalyptic number.

It is an amenable number.

121553144401 is a deficient number, since it is larger than the sum of its proper divisors (9350241891).

121553144401 is an equidigital number, since it uses as much as digits as its factorization.

121553144401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9350241890.

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 121553144401 its reverse (104441355121), we get a palindrome (225994499522).

The spelling of 121553144401 in words is "one hundred twenty-one billion, five hundred fifty-three million, one hundred forty-four thousand, four hundred one".