21232123112 has 64 divisors (see below), whose sum is σ = 40894882560. Its totient is φ = 10331193600.

The previous prime is 21232123111. The next prime is 21232123139. The reversal of 21232123112 is 21132123212.

It is not an unprimeable number, because it can be changed into a prime (21232123111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23305937 + ... + 23306847.

It is an arithmetic number, because the mean of its divisors is an integer number (638982540).

Almost surely, 2^21232123112 is an apocalyptic number.

It is an amenable number.

21232123112 is a deficient number, since it is larger than the sum of its proper divisors (19662759448).

21232123112 is a wasteful number, since it uses less digits than its factorization.

21232123112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1434 (or 1430 counting only the distinct ones).

The product of its digits is 288, while the sum is 20.

Adding to 21232123112 its reverse (21132123212), we get a palindrome (42364246324).

The spelling of 21232123112 in words is "twenty-one billion, two hundred thirty-two million, one hundred twenty-three thousand, one hundred twelve".