21222021112220 has 12 divisors (see below), whose sum is σ = 44566244335704. Its totient is φ = 8488808444880.

The previous prime is 21222021112219. The next prime is 21222021112223. The reversal of 21222021112220 is 2221112022212.

It is a super-2 number, since 2×21222021112220² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 1061101055611 = 21222021112220 / (2 + 1 + 2 + 2 + 2 + 0 + 2 + 1 + 1 + 1 + 2 + 2 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 21222021112192 and 21222021112201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222021112223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 530550527786 + ... + 530550527825.

It is an arithmetic number, because the mean of its divisors is an integer number (3713853694642).

Almost surely, 2^{21222021112220} is an apocalyptic number.

21222021112220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21222021112220 is an abundant number, since it is smaller than the sum of its proper divisors (23344223223484).

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

21222021112220 is a wasteful number, since it uses less digits than its factorization.

21222021112220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1061101055620 (or 1061101055618 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21222021112220 its reverse (2221112022212), we get a palindrome (23443133134432).

The spelling of 21222021112220 in words is "twenty-one trillion, two hundred twenty-two billion, twenty-one million, one hundred twelve thousand, two hundred twenty".