1212445404505 has 4 divisors (see below), whose sum is σ = 1454934485412. Its totient is φ = 969956323600.

The previous prime is 1212445404491. The next prime is 1212445404557. The reversal of 1212445404505 is 5054045442121.

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 141203844441 + 1071241560064 = 375771^2 + 1035008^2 .

It is not a de Polignac number, because 1212445404505 - 2⁵ = 1212445404473 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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121244540446 + ... + 121244540455.

It is an arithmetic number, because the mean of its divisors is an integer number (363733621353).

Almost surely, 2^{1212445404505} is an apocalyptic number.

It is an amenable number.

1212445404505 is a deficient number, since it is larger than the sum of its proper divisors (242489080907).

1212445404505 is an equidigital number, since it uses as much as digits as its factorization.

1212445404505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242489080906.

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

The spelling of 1212445404505 in words is "one trillion, two hundred twelve billion, four hundred forty-five million, four hundred four thousand, five hundred five".