21112111303 has 4 divisors (see below), whose sum is σ = 21113074528. Its totient is φ = 21111148080.

The previous prime is 21112111289. The next prime is 21112111343. The reversal of 21112111303 is 30311121112.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21112111303 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 (21112111343) 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, 447951 + ... + 492832.

It is an arithmetic number, because the mean of its divisors is an integer number (5278268632).

Almost surely, 2^21112111303 is an apocalyptic number.

21112111303 is a deficient number, since it is larger than the sum of its proper divisors (963225).

21112111303 is an equidigital number, since it uses as much as digits as its factorization.

21112111303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 963224.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 21112111303 its reverse (30311121112), we get a palindrome (51423232415).

The spelling of 21112111303 in words is "twenty-one billion, one hundred twelve million, one hundred eleven thousand, three hundred three".