21110031003 has 4 divisors (see below), whose sum is σ = 28146708008. Its totient is φ = 14073354000.

The previous prime is 21110031001. The next prime is 21110031013. The reversal of 21110031003 is 30013001112.

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

It is not a de Polignac number, because 21110031003 - 2¹ = 21110031001 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 21110031003.

It is not an unprimeable number, because it can be changed into a prime (21110031001) 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, 3518338498 + ... + 3518338503.

It is an arithmetic number, because the mean of its divisors is an integer number (7036677002).

Almost surely, 2^21110031003 is an apocalyptic number.

21110031003 is a deficient number, since it is larger than the sum of its proper divisors (7036677005).

21110031003 is an equidigital number, since it uses as much as digits as its factorization.

21110031003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7036677004.

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

Adding to 21110031003 its reverse (30013001112), we get a palindrome (51123032115).

The spelling of 21110031003 in words is "twenty-one billion, one hundred ten million, thirty-one thousand, three".