21234120032 has 48 divisors (see below), whose sum is σ = 42958223280. Its totient is φ = 10324412928.

The previous prime is 21234120031. The next prime is 21234120043. The reversal of 21234120032 is 23002143212.

It is a junction number, because it is equal to n+sod(n) for n = 21234119986 and 21234120013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234120031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2824823 + ... + 2832329.

It is an arithmetic number, because the mean of its divisors is an integer number (894962985).

Almost surely, 2^21234120032 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 21234120032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21479111640).

21234120032 is an abundant number, since it is smaller than the sum of its proper divisors (21724103248).

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

21234120032 is a wasteful number, since it uses less digits than its factorization.

21234120032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9943 (or 9935 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21234120032 its reverse (23002143212), we get a palindrome (44236263244).

The spelling of 21234120032 in words is "twenty-one billion, two hundred thirty-four million, one hundred twenty thousand, thirty-two".