21232112020 has 96 divisors (see below), whose sum is σ = 53684064000. Its totient is φ = 6890655744.

The previous prime is 21232111993. The next prime is 21232112023. The reversal of 21232112020 is 2021123212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21232111985 and 21232112003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21232112023) 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, 4117764 + ... + 4122916.

It is an arithmetic number, because the mean of its divisors is an integer number (559209000).

Almost surely, 2^21232112020 is an apocalyptic number.

21232112020 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 21232112020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26842032000).

21232112020 is an abundant number, since it is smaller than the sum of its proper divisors (32451951980).

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

21232112020 is a wasteful number, since it uses less digits than its factorization.

21232112020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6737 (or 6735 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21232112020 its reverse (2021123212), we get a palindrome (23253235232).

The spelling of 21232112020 in words is "twenty-one billion, two hundred thirty-two million, one hundred twelve thousand, twenty".