21011320003103 has 4 divisors (see below), whose sum is σ = 21011871244560. Its totient is φ = 21010768761648.

The previous prime is 21011320003027. The next prime is 21011320003123. The reversal of 21011320003103 is 30130002311012.

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 21011320003103 - 2¹⁶ = 21011319937567 is a prime.

It is a super-3 number, since 3×21011320003103³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011320003123) 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, 275563550 + ... + 275639787.

It is an arithmetic number, because the mean of its divisors is an integer number (5252967811140).

Almost surely, 2^{21011320003103} is an apocalyptic number.

21011320003103 is a deficient number, since it is larger than the sum of its proper divisors (551241457).

21011320003103 is an equidigital number, since it uses as much as digits as its factorization.

21011320003103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551241456.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21011320003103 its reverse (30130002311012), we get a palindrome (51141322314115).

The spelling of 21011320003103 in words is "twenty-one trillion, eleven billion, three hundred twenty million, three thousand, one hundred three".