21011030003 has 2 divisors, whose sum is σ = 21011030004. Its totient is φ = 21011030002.

The previous prime is 21011029999. The next prime is 21011030041. The reversal of 21011030003 is 30003011012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21011030003 - 2² = 21011029999 is a prime.

It is not a weakly prime, because it can be changed into another prime (21011030603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505515001 + 10505515002.

It is an arithmetic number, because the mean of its divisors is an integer number (10505515002).

Almost surely, 2^21011030003 is an apocalyptic number.

21011030003 is a deficient number, since it is larger than the sum of its proper divisors (1).

21011030003 is an equidigital number, since it uses as much as digits as its factorization.

21011030003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18, while the sum is 11.

Adding to 21011030003 its reverse (30003011012), we get a palindrome (51014041015).

The spelling of 21011030003 in words is "twenty-one billion, eleven million, thirty thousand, three".