1000201121 has 4 divisors (see below), whose sum is σ = 1000274052. Its totient is φ = 1000128192.

The previous prime is 1000201063. The next prime is 1000201123. The reversal of 1000201121 is 1211020001.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 428034721 + 572166400 = 20689^2 + 23920^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000201121 - 2¹⁸ = 999938977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1000201099 and 1000201108.

It is not an unprimeable number, because it can be changed into a prime (1000201123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8996 + ... + 45621.

It is an arithmetic number, because the mean of its divisors is an integer number (250068513).

Almost surely, 2^1000201121 is an apocalyptic number.

It is an amenable number.

1000201121 is a deficient number, since it is larger than the sum of its proper divisors (72931).

1000201121 is an equidigital number, since it uses as much as digits as its factorization.

1000201121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72930.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1000201121 is about 31625.9564440350. The cubic root of 1000201121 is about 1000.0670358394.

Adding to 1000201121 its reverse (1211020001), we get a palindrome (2211221122).

The spelling of 1000201121 in words is "one billion, two hundred one thousand, one hundred twenty-one".