21232123192 has 64 divisors (see below), whose sum is σ = 47973139200. Its totient is φ = 8605958400.

The previous prime is 21232123163. The next prime is 21232123207. The reversal of 21232123192 is 29132123212.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 21232123192.

It is a congruent number.

It is an unprimeable number.

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, 622863 + ... + 656065.

It is an arithmetic number, because the mean of its divisors is an integer number (749580300).

Almost surely, 2^21232123192 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21232123192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23986569600).

21232123192 is an abundant number, since it is smaller than the sum of its proper divisors (26741016008).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21232123192 is a wasteful number, since it uses less digits than its factorization.

21232123192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33836 (or 33832 counting only the distinct ones).

The product of its digits is 2592, while the sum is 28.

The spelling of 21232123192 in words is "twenty-one billion, two hundred thirty-two million, one hundred twenty-three thousand, one hundred ninety-two".