1000200121 has 4 divisors (see below), whose sum is σ = 1000320244. Its totient is φ = 1000080000.

The previous prime is 1000200107. The next prime is 1000200127. The reversal of 1000200121 is 1210020001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 351937600 + 648262521 = 18760^2 + 25461^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000200121 - 2²¹ = 998102969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1000200127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46560 + ... + 64561.

It is an arithmetic number, because the mean of its divisors is an integer number (250080061).

Almost surely, 2^1000200121 is an apocalyptic number.

It is an amenable number.

1000200121 is a deficient number, since it is larger than the sum of its proper divisors (120123).

1000200121 is an equidigital number, since it uses as much as digits as its factorization.

1000200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120122.

The product of its (nonzero) digits is 4, while the sum is 7.

The square root of 1000200121 is about 31625.9406342325. The cubic root of 1000200121 is about 1000.0667025507.

Adding to 1000200121 its reverse (1210020001), we get a palindrome (2210220122).

The spelling of 1000200121 in words is "one billion, two hundred thousand, one hundred twenty-one".