1000203203121 has 4 divisors (see below), whose sum is σ = 1333604270832. Its totient is φ = 666802135412.

The previous prime is 1000203203063. The next prime is 1000203203137. The reversal of 1000203203121 is 1213023020001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1000203203121 - 2¹¹ = 1000203201073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1000203203121.

It is not an unprimeable number, because it can be changed into a prime (1000203203191) 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, 166700533851 + ... + 166700533856.

It is an arithmetic number, because the mean of its divisors is an integer number (333401067708).

Almost surely, 2^{1000203203121} is an apocalyptic number.

It is an amenable number.

1000203203121 is a deficient number, since it is larger than the sum of its proper divisors (333401067711).

1000203203121 is an equidigital number, since it uses as much as digits as its factorization.

1000203203121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333401067710.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 1000203203121 its reverse (1213023020001), we get a palindrome (2213226223122).

The spelling of 1000203203121 in words is "one trillion, two hundred three million, two hundred three thousand, one hundred twenty-one".