21222133340220 has 144 divisors (see below), whose sum is σ = 64856676804192. Its totient is φ = 5616940492800.

The previous prime is 21222133340207. The next prime is 21222133340227. The reversal of 21222133340220 is 2204333122212.

21222133340220 is a `hidden beast` number, since 2 + 1 + 2 + 221 + 3 + 33 + 402 + 2 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222133340227) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12318895 + ... + 13935545.

It is an arithmetic number, because the mean of its divisors is an integer number (450393588918).

Almost surely, 2^{21222133340220} is an apocalyptic number.

21222133340220 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 21222133340220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32428338402096).

21222133340220 is an abundant number, since it is smaller than the sum of its proper divisors (43634543463972).

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

21222133340220 is a wasteful number, since it uses less digits than its factorization.

21222133340220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1617212 (or 1617207 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 21222133340220 its reverse (2204333122212), we get a palindrome (23426466462432).

The spelling of 21222133340220 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred thirty-three million, three hundred forty thousand, two hundred twenty".