1021112020505 has 16 divisors (see below), whose sum is σ = 1238563213200. Its totient is φ = 808084761600.

The previous prime is 1021112020501. The next prime is 1021112020519. The reversal of 1021112020505 is 5050202111201.

It can be written as a sum of positive squares in 8 ways, for example, as 52611973129 + 968500047376 = 229373^2 + 984124^2 .

It is not a de Polignac number, because 1021112020505 - 2² = 1021112020501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1021112020501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 325340 + ... + 1465629.

It is an arithmetic number, because the mean of its divisors is an integer number (77410200825).

Almost surely, 2^{1021112020505} is an apocalyptic number.

It is an amenable number.

1021112020505 is a deficient number, since it is larger than the sum of its proper divisors (217451192695).

1021112020505 is a wasteful number, since it uses less digits than its factorization.

1021112020505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1792204.

The product of its (nonzero) digits is 200, while the sum is 20.

Adding to 1021112020505 its reverse (5050202111201), we get a palindrome (6071314131706).

The spelling of 1021112020505 in words is "one trillion, twenty-one billion, one hundred twelve million, twenty thousand, five hundred five".