20212100220 has 96 divisors (see below), whose sum is σ = 61146505728. Its totient is φ = 4959021312.

The previous prime is 20212100213. The next prime is 20212100273. The reversal of 20212100220 is 2200121202.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 20212100196 and 20212100205.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 197257 + ... + 281663.

It is an arithmetic number, because the mean of its divisors is an integer number (636942768).

Almost surely, 2^20212100220 is an apocalyptic number.

20212100220 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 20212100220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30573252864).

20212100220 is an abundant number, since it is smaller than the sum of its proper divisors (40934405508).

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

20212100220 is a wasteful number, since it uses less digits than its factorization.

20212100220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84739 (or 84737 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 20212100220 its reverse (2200121202), we get a palindrome (22412221422).

The spelling of 20212100220 in words is "twenty billion, two hundred twelve million, one hundred thousand, two hundred twenty".