2121200003 has 4 divisors (see below), whose sum is σ = 2284369248. Its totient is φ = 1958030760.

The previous prime is 2121199999. The next prime is 2121200021. The reversal of 2121200003 is 3000021212.

It is a happy number.

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 2121200003 - 2² = 2121199999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2121200023) 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, 81584603 + ... + 81584628.

It is an arithmetic number, because the mean of its divisors is an integer number (571092312).

Almost surely, 2^2121200003 is an apocalyptic number.

2121200003 is a deficient number, since it is larger than the sum of its proper divisors (163169245).

2121200003 is a wasteful number, since it uses less digits than its factorization.

2121200003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163169244.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 2121200003 is about 46056.4870892256. The cubic root of 2121200003 is about 1284.8739959315.

Adding to 2121200003 its reverse (3000021212), we get a palindrome (5121221215).

The spelling of 2121200003 in words is "two billion, one hundred twenty-one million, two hundred thousand, three".