1121000205 has 16 divisors (see below), whose sum is σ = 1931569920. Its totient is φ = 551876928.

The previous prime is 1121000161. The next prime is 1121000219. The reversal of 1121000205 is 5020001211.

It is not a de Polignac number, because 1121000205 - 2⁶ = 1121000141 is a prime.

It is a super-2 number, since 2×1121000205² = 2513282919220084050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2874165 + ... + 2874554.

It is an arithmetic number, because the mean of its divisors is an integer number (120723120).

Almost surely, 2^1121000205 is an apocalyptic number.

1121000205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1121000205 is a deficient number, since it is larger than the sum of its proper divisors (810569715).

1121000205 is a wasteful number, since it uses less digits than its factorization.

1121000205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5748740.

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 1121000205 is about 33481.3411469732. The cubic root of 1121000205 is about 1038.8078687816.

Adding to 1121000205 its reverse (5020001211), we get a palindrome (6141001416).

The spelling of 1121000205 in words is "one billion, one hundred twenty-one million, two hundred five", and thus it is an aban number.