21000210003 has 6 divisors (see below), whose sum is σ = 30333636684. Its totient is φ = 14000139996.

The previous prime is 21000209983. The next prime is 21000210019. The reversal of 21000210003 is 30001200012.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-21000210003 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2333356667 = 21000210003 / (2 + 1 + 0 + 0 + 0 + 2 + 1 + 0 + 0 + 0 + 3).

It is not an unprimeable number, because it can be changed into a prime (21000210403) 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 5 ways as a sum of consecutive naturals, for example, 1166678325 + ... + 1166678342.

It is an arithmetic number, because the mean of its divisors is an integer number (5055606114).

Almost surely, 2^21000210003 is an apocalyptic number.

21000210003 is a deficient number, since it is larger than the sum of its proper divisors (9333426681).

21000210003 is a wasteful number, since it uses less digits than its factorization.

21000210003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2333356673 (or 2333356670 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 9.

Adding to 21000210003 its reverse (30001200012), we get a palindrome (51001410015).

Subtracting 21000210003 from its reverse (30001200012), we obtain a palindrome (9000990009).

The spelling of 21000210003 in words is "twenty-one billion, two hundred ten thousand, three".