21321110121231 has 64 divisors (see below), whose sum is σ = 29510338867200. Its totient is φ = 13685376466944.

The previous prime is 21321110121193. The next prime is 21321110121271. The reversal of 21321110121231 is 13212101112312.

It is not a de Polignac number, because 21321110121231 - 2¹⁰ = 21321110120207 is a prime.

It is a super-2 number, since 2×21321110121231² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21321110121198 and 21321110121207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321110121271) 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 63 ways as a sum of consecutive naturals, for example, 3124884486 + ... + 3124891308.

It is an arithmetic number, because the mean of its divisors is an integer number (461099044800).

Almost surely, 2^{21321110121231} is an apocalyptic number.

21321110121231 is a deficient number, since it is larger than the sum of its proper divisors (8189228745969).

21321110121231 is a wasteful number, since it uses less digits than its factorization.

21321110121231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8440.

The product of its (nonzero) digits is 144, while the sum is 21.

Adding to 21321110121231 its reverse (13212101112312), we get a palindrome (34533211233543).

The spelling of 21321110121231 in words is "twenty-one trillion, three hundred twenty-one billion, one hundred ten million, one hundred twenty-one thousand, two hundred thirty-one".