1000121205 has 16 divisors (see below), whose sum is σ = 1601012160. Its totient is φ = 533125248.

The previous prime is 1000121197. The next prime is 1000121257. The reversal of 1000121205 is 5021210001.

It is not a de Polignac number, because 1000121205 - 2³ = 1000121197 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15241 + ... + 47249.

It is an arithmetic number, because the mean of its divisors is an integer number (100063260).

Almost surely, 2^1000121205 is an apocalyptic number.

1000121205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1000121205 is a deficient number, since it is larger than the sum of its proper divisors (600890955).

1000121205 is a wasteful number, since it uses less digits than its factorization.

1000121205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34100.

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

The square root of 1000121205 is about 31624.6929629364. The cubic root of 1000121205 is about 1000.0404000345.

Adding to 1000121205 its reverse (5021210001), we get a palindrome (6021331206).

The spelling of 1000121205 in words is "one billion, one hundred twenty-one thousand, two hundred five".