21112212000220 has 96 divisors (see below), whose sum is σ = 48580504733376. Its totient is φ = 7643162726400.

The previous prime is 21112212000181. The next prime is 21112212000221. The reversal of 21112212000220 is 2200021221112.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21112212000194 and 21112212000203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112212000221) 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, 194900394 + ... + 195008686.

It is an arithmetic number, because the mean of its divisors is an integer number (506046924306).

Almost surely, 2^{21112212000220} is an apocalyptic number.

21112212000220 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 21112212000220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24290252366688).

21112212000220 is an abundant number, since it is smaller than the sum of its proper divisors (27468292733156).

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

21112212000220 is a wasteful number, since it uses less digits than its factorization.

21112212000220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112231 (or 112229 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21112212000220 its reverse (2200021221112), we get a palindrome (23312233221332).

The spelling of 21112212000220 in words is "twenty-one trillion, one hundred twelve billion, two hundred twelve million, two hundred twenty", and thus it is an aban number.