21031210123231 has 48 divisors (see below), whose sum is σ = 26544040886272. Its totient is φ = 16310657975040.

The previous prime is 21031210123141. The next prime is 21031210123241. The reversal of 21031210123231 is 13232101213012.

It is not a de Polignac number, because 21031210123231 - 2⁹ = 21031210122719 is a prime.

It is a super-2 number, since 2×21031210123231² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031210123241) 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 47 ways as a sum of consecutive naturals, for example, 1021269271 + ... + 1021289863.

Almost surely, 2^{21031210123231} is an apocalyptic number.

21031210123231 is a deficient number, since it is larger than the sum of its proper divisors (5512830763041).

21031210123231 is a wasteful number, since it uses less digits than its factorization.

21031210123231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26252 (or 26241 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 21031210123231 its reverse (13232101213012), we get a palindrome (34263311336243).

The spelling of 21031210123231 in words is "twenty-one trillion, thirty-one billion, two hundred ten million, one hundred twenty-three thousand, two hundred thirty-one".