21000003331003 has 4 divisors (see below), whose sum is σ = 21000100223088. Its totient is φ = 20999906438920.

The previous prime is 21000003330983. The next prime is 21000003331007. The reversal of 21000003331003 is 30013330000012.

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 21000003331003 - 2²¹ = 21000001233851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000003331007) 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, 48120208 + ... + 48554653.

It is an arithmetic number, because the mean of its divisors is an integer number (5250025055772).

Almost surely, 2^{21000003331003} is an apocalyptic number.

21000003331003 is a deficient number, since it is larger than the sum of its proper divisors (96892085).

21000003331003 is an equidigital number, since it uses as much as digits as its factorization.

21000003331003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96892084.

The product of its (nonzero) digits is 162, while the sum is 16.

Adding to 21000003331003 its reverse (30013330000012), we get a palindrome (51013333331015).

The spelling of 21000003331003 in words is "twenty-one trillion, three million, three hundred thirty-one thousand, three".