21101100003 has 12 divisors (see below), whose sum is σ = 30647763328.
Its totient is φ = 13989678480.
The previous prime is 21101099989. The next prime is 21101100061. The reversal of 21101100003 is 30000110112.
Adding to 21101100003 its reverse (30000110112), we get a palindrome (51101210115).
It can be divided in two parts, 21101 and 100003, that added together give a square (121104 = 3482).
It is not a de Polignac number, because 21101100003 - 26 = 21101099939 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (9).
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (21101100073) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6475075 + ... + 6478332.
Almost surely, 221101100003 is an apocalyptic number.
21101100003 is a deficient number, since it is larger than the sum of its proper divisors (9546663325).
21101100003 is a wasteful number, since it uses less digits than its factorization.
21101100003 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 12953594 (or 12953591 counting only the distinct ones).
The product of its (nonzero) digits is 6, while the sum is 9.
The spelling of 21101100003 in words is "twenty-one billion, one hundred one million, one hundred thousand, three".