21011320103 has 8 divisors (see below), whose sum is σ = 21067701600. Its totient is φ = 20954978208.

The previous prime is 21011320067. The next prime is 21011320133. The reversal of 21011320103 is 30102311012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21011320103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011320133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1268825 + ... + 1285277.

It is an arithmetic number, because the mean of its divisors is an integer number (2633462700).

Almost surely, 2^21011320103 is an apocalyptic number.

21011320103 is a deficient number, since it is larger than the sum of its proper divisors (56381497).

21011320103 is a wasteful number, since it uses less digits than its factorization.

21011320103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19801.

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21011320103 its reverse (30102311012), we get a palindrome (51113631115).

Subtracting 21011320103 from its reverse (30102311012), we obtain a palindrome (9090990909).

The spelling of 21011320103 in words is "twenty-one billion, eleven million, three hundred twenty thousand, one hundred three".