1000212211205 has 16 divisors (see below), whose sum is σ = 1232806001904. Its totient is φ = 778472801280.

The previous prime is 1000212211199. The next prime is 1000212211217. The reversal of 1000212211205 is 5021122120001.

It can be written as a sum of positive squares in 8 ways, for example, as 254598958084 + 745613253121 = 504578^2 + 863489^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1000212211205 is a prime.

It is a Duffinian number.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 1843229 + ... + 2323341.

It is an arithmetic number, because the mean of its divisors is an integer number (77050375119).

Almost surely, 2^{1000212211205} is an apocalyptic number.

It is an amenable number.

1000212211205 is a deficient number, since it is larger than the sum of its proper divisors (232593790699).

1000212211205 is a wasteful number, since it uses less digits than its factorization.

1000212211205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 491416.

The product of its (nonzero) digits is 80, while the sum is 17.

Adding to 1000212211205 its reverse (5021122120001), we get a palindrome (6021334331206).

The spelling of 1000212211205 in words is "one trillion, two hundred twelve million, two hundred eleven thousand, two hundred five".