21311312031103 has 32 divisors (see below), whose sum is σ = 23507449574400. Its totient is φ = 19230122774016.

The previous prime is 21311312031077. The next prime is 21311312031137. The reversal of 21311312031103 is 30113021311312.

It is a cyclic number.

It is not a de Polignac number, because 21311312031103 - 2³³ = 21302722096511 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 (21311312031803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 274531351 + ... + 274608967.

It is an arithmetic number, because the mean of its divisors is an integer number (734607799200).

Almost surely, 2^{21311312031103} is an apocalyptic number.

21311312031103 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21311312031103 is a deficient number, since it is larger than the sum of its proper divisors (2196137543297).

21311312031103 is a wasteful number, since it uses less digits than its factorization.

21311312031103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80311.

The product of its (nonzero) digits is 324, while the sum is 22.

Adding to 21311312031103 its reverse (30113021311312), we get a palindrome (51424333342415).

The spelling of 21311312031103 in words is "twenty-one trillion, three hundred eleven billion, three hundred twelve million, thirty-one thousand, one hundred three".