21231310132123 has 32 divisors (see below), whose sum is σ = 27035222578560. Its totient is φ = 16217154616320.

The previous prime is 21231310132063. The next prime is 21231310132133. The reversal of 21231310132123 is 32123101313212.

It is a de Polignac number, because none of the positive numbers 2^k-21231310132123 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21231310132133) 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, 21205911 + ... + 22184527.

It is an arithmetic number, because the mean of its divisors is an integer number (844850705580).

Almost surely, 2^{21231310132123} is an apocalyptic number.

21231310132123 is a deficient number, since it is larger than the sum of its proper divisors (5803912446437).

21231310132123 is a wasteful number, since it uses less digits than its factorization.

21231310132123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 986887.

The product of its (nonzero) digits is 1296, while the sum is 25.

Adding to 21231310132123 its reverse (32123101313212), we get a palindrome (53354411445335).

The spelling of 21231310132123 in words is "twenty-one trillion, two hundred thirty-one billion, three hundred ten million, one hundred thirty-two thousand, one hundred twenty-three".