21010100003 has 18 divisors (see below), whose sum is σ = 22965416604. Its totient is φ = 19217672208.

The previous prime is 21010099987. The next prime is 21010100021. The reversal of 21010100003 is 30000101012.

It is not a de Polignac number, because 21010100003 - 2⁴ = 21010099987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010100203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 269000 + ... + 338202.

It is an arithmetic number, because the mean of its divisors is an integer number (1275856478).

Almost surely, 2^21010100003 is an apocalyptic number.

21010100003 is a deficient number, since it is larger than the sum of its proper divisors (1955316601).

21010100003 is an equidigital number, since it uses as much as digits as its factorization.

21010100003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69299 (or 69251 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 8.

Adding to 21010100003 its reverse (30000101012), we get a palindrome (51010201015).

The spelling of 21010100003 in words is "twenty-one billion, ten million, one hundred thousand, three".