21100100003 has 4 divisors (see below), whose sum is σ = 21101076480. Its totient is φ = 21099123528.

The previous prime is 21100099961. The next prime is 21100100011. The reversal of 21100100003 is 30000100112.

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 21100100003 - 2¹⁰ = 21100098979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21100100033) 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, 455075 + ... + 499292.

It is an arithmetic number, because the mean of its divisors is an integer number (5275269120).

Almost surely, 2^21100100003 is an apocalyptic number.

21100100003 is a deficient number, since it is larger than the sum of its proper divisors (976477).

21100100003 is an equidigital number, since it uses as much as digits as its factorization.

21100100003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 976476.

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

Adding to 21100100003 its reverse (30000100112), we get a palindrome (51100200115).

The spelling of 21100100003 in words is "twenty-one billion, one hundred million, one hundred thousand, three".