1012120205 has 4 divisors (see below), whose sum is σ = 1214544252. Its totient is φ = 809696160.

The previous prime is 1012120201. The next prime is 1012120217. The reversal of 1012120205 is 5020212101.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5020212101 = 3923 ⋅1279687.

It can be written as a sum of positive squares in 2 ways, for example, as 529966441 + 482153764 = 23021^2 + 21958^2 .

It is not a de Polignac number, because 1012120205 - 2² = 1012120201 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1012120205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012120201) by changing a digit.

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, 101212016 + ... + 101212025.

It is an arithmetic number, because the mean of its divisors is an integer number (303636063).

Almost surely, 2^1012120205 is an apocalyptic number.

It is an amenable number.

1012120205 is a deficient number, since it is larger than the sum of its proper divisors (202424047).

1012120205 is an equidigital number, since it uses as much as digits as its factorization.

1012120205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202424046.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 1012120205 is about 31813.8366909746. The cubic root of 1012120205 is about 1004.0238552053.

Adding to 1012120205 its reverse (5020212101), we get a palindrome (6032332306).

The spelling of 1012120205 in words is "one billion, twelve million, one hundred twenty thousand, two hundred five".