121224045020545 has 4 divisors (see below), whose sum is σ = 145468854024660. Its totient is φ = 96979236016432.

The previous prime is 121224045020537. The next prime is 121224045020569. The reversal of 121224045020545 is 545020540422121.

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 17722070838081 + 103501974182464 = 4209759^2 + 10173592^2 .

It is a cyclic number.

It is not a de Polignac number, because 121224045020545 - 2³ = 121224045020537 is a prime.

It is a super-2 number, since 2×121224045020545² (a number of 29 digits) contains 22 as substring.

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, 12122404502050 + ... + 12122404502059.

It is an arithmetic number, because the mean of its divisors is an integer number (36367213506165).

Almost surely, 2^{121224045020545} is an apocalyptic number.

It is an amenable number.

121224045020545 is a deficient number, since it is larger than the sum of its proper divisors (24244809004115).

121224045020545 is an equidigital number, since it uses as much as digits as its factorization.

121224045020545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24244809004114.

The product of its (nonzero) digits is 128000, while the sum is 37.

Adding to 121224045020545 its reverse (545020540422121), we get a palindrome (666244585442666).

The spelling of 121224045020545 in words is "one hundred twenty-one trillion, two hundred twenty-four billion, forty-five million, twenty thousand, five hundred forty-five".