21100113003 has 4 divisors (see below), whose sum is σ = 28133484008. Its totient is φ = 14066742000.

The previous prime is 21100112993. The next prime is 21100113049. The reversal of 21100113003 is 30031100112.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21100113003 - 2¹⁶ = 21100047467 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21100113003.

It is not an unprimeable number, because it can be changed into a prime (21100133003) 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, 3516685498 + ... + 3516685503.

It is an arithmetic number, because the mean of its divisors is an integer number (7033371002).

Almost surely, 2^21100113003 is an apocalyptic number.

21100113003 is a deficient number, since it is larger than the sum of its proper divisors (7033371005).

21100113003 is an equidigital number, since it uses as much as digits as its factorization.

21100113003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7033371004.

The product of its (nonzero) digits is 18, while the sum is 12.

Adding to 21100113003 its reverse (30031100112), we get a palindrome (51131213115).

The spelling of 21100113003 in words is "twenty-one billion, one hundred million, one hundred thirteen thousand, three".