1208552558021 has 4 divisors (see below), whose sum is σ = 1208633234592. Its totient is φ = 1208471881452.

The previous prime is 1208552557981. The next prime is 1208552558029.

1208552558021 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1208552558021 - 2¹⁰ = 1208552556997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1208552558029) 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 3 ways as a sum of consecutive naturals, for example, 40315811 + ... + 40345776.

It is an arithmetic number, because the mean of its divisors is an integer number (302158308648).

Almost surely, 2^{1208552558021} is an apocalyptic number.

It is an amenable number.

1208552558021 is a deficient number, since it is larger than the sum of its proper divisors (80676571).

1208552558021 is an equidigital number, since it uses as much as digits as its factorization.

1208552558021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80676570.

The product of its (nonzero) digits is 320000, while the sum is 44.

The spelling of 1208552558021 in words is "one trillion, two hundred eight billion, five hundred fifty-two million, five hundred fifty-eight thousand, twenty-one".