21103112123231 has 8 divisors (see below), whose sum is σ = 22222770311280. Its totient is φ = 19984350742848.

The previous prime is 21103112123179. The next prime is 21103112123251. The reversal of 21103112123231 is 13232121130112.

It is a happy number.

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-21103112123231 is a prime.

It is a super-2 number, since 2×21103112123231² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21103112123197 and 21103112123206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103112123251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224153606 + ... + 224247731.

It is an arithmetic number, because the mean of its divisors is an integer number (2777846288910).

Almost surely, 2^{21103112123231} is an apocalyptic number.

21103112123231 is a deficient number, since it is larger than the sum of its proper divisors (1119658188049).

21103112123231 is a wasteful number, since it uses less digits than its factorization.

21103112123231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 448403833.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 21103112123231 its reverse (13232121130112), we get a palindrome (34335233253343).

The spelling of 21103112123231 in words is "twenty-one trillion, one hundred three billion, one hundred twelve million, one hundred twenty-three thousand, two hundred thirty-one".