2121001003 has 4 divisors (see below), whose sum is σ = 2313819288. Its totient is φ = 1928182720.

The previous prime is 2121000991. The next prime is 2121001019. The reversal of 2121001003 is 3001001212.

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

It is a cyclic number.

It is not a de Polignac number, because 2121001003 - 2⁹ = 2121000491 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121001033) 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, 96409126 + ... + 96409147.

It is an arithmetic number, because the mean of its divisors is an integer number (578454822).

Almost surely, 2^2121001003 is an apocalyptic number.

2121001003 is a deficient number, since it is larger than the sum of its proper divisors (192818285).

2121001003 is a wasteful number, since it uses less digits than its factorization.

2121001003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192818284.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 2121001003 is about 46054.3266479926. The cubic root of 2121001003 is about 1284.8338146000.

Adding to 2121001003 its reverse (3001001212), we get a palindrome (5122002215).

The spelling of 2121001003 in words is "two billion, one hundred twenty-one million, one thousand, three".