21032432120 has 128 divisors (see below), whose sum is σ = 56162160000. Its totient is φ = 6935857152.

The previous prime is 21032432039. The next prime is 21032432129. The reversal of 21032432120 is 2123423012.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21032432092 and 21032432101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032432129) 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, 2179466 + ... + 2189094.

It is an arithmetic number, because the mean of its divisors is an integer number (438766875).

Almost surely, 2^21032432120 is an apocalyptic number.

21032432120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21032432120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28081080000).

21032432120 is an abundant number, since it is smaller than the sum of its proper divisors (35129727880).

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

21032432120 is a wasteful number, since it uses less digits than its factorization.

21032432120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9945 (or 9941 counting only the distinct ones).

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

Adding to 21032432120 its reverse (2123423012), we get a palindrome (23155855132).

The spelling of 21032432120 in words is "twenty-one billion, thirty-two million, four hundred thirty-two thousand, one hundred twenty".