21232110220 has 48 divisors (see below), whose sum is σ = 47371570848. Its totient is φ = 7965946880.

The previous prime is 21232110197. The next prime is 21232110233. The reversal of 21232110220 is 2201123212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21232110194 and 21232110203.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6946 + ... + 206185.

It is an arithmetic number, because the mean of its divisors is an integer number (986907726).

Almost surely, 2^21232110220 is an apocalyptic number.

21232110220 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 21232110220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23685785424).

21232110220 is an abundant number, since it is smaller than the sum of its proper divisors (26139460628).

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

21232110220 is a wasteful number, since it uses less digits than its factorization.

21232110220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213450 (or 213448 counting only the distinct ones).

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

Adding to 21232110220 its reverse (2201123212), we get a palindrome (23433233432).

The spelling of 21232110220 in words is "twenty-one billion, two hundred thirty-two million, one hundred ten thousand, two hundred twenty".