21311330312103 has 32 divisors (see below), whose sum is σ = 30856629436416. Its totient is φ = 13005158923008.

The previous prime is 21311330312087. The next prime is 21311330312137. The reversal of 21311330312103 is 30121303311312.

It is not a de Polignac number, because 21311330312103 - 2⁴ = 21311330312087 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21311330312183) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9306075 + ... + 11367747.

It is an arithmetic number, because the mean of its divisors is an integer number (964269669888).

Almost surely, 2^{21311330312103} is an apocalyptic number.

21311330312103 is a deficient number, since it is larger than the sum of its proper divisors (9545299124313).

21311330312103 is a wasteful number, since it uses less digits than its factorization.

21311330312103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2063903.

The product of its (nonzero) digits is 972, while the sum is 24.

Adding to 21311330312103 its reverse (30121303311312), we get a palindrome (51432633623415).

The spelling of 21311330312103 in words is "twenty-one trillion, three hundred eleven billion, three hundred thirty million, three hundred twelve thousand, one hundred three".