121401455555 has 4 divisors (see below), whose sum is σ = 145681746672. Its totient is φ = 97121164440.

The previous prime is 121401455543. The next prime is 121401455563. The reversal of 121401455555 is 555554104121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 555554104121 = 191 ⋅2908660231.

It is not a de Polignac number, because 121401455555 - 2³⁶ = 52681978819 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12140145551 + ... + 12140145560.

It is an arithmetic number, because the mean of its divisors is an integer number (36420436668).

Almost surely, 2^121401455555 is an apocalyptic number.

121401455555 is a deficient number, since it is larger than the sum of its proper divisors (24280291117).

121401455555 is an equidigital number, since it uses as much as digits as its factorization.

121401455555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24280291116.

The product of its (nonzero) digits is 100000, while the sum is 38.

Adding to 121401455555 its reverse (555554104121), we get a palindrome (676955559676).

The spelling of 121401455555 in words is "one hundred twenty-one billion, four hundred one million, four hundred fifty-five thousand, five hundred fifty-five".