21222110201220 has 144 divisors (see below), whose sum is σ = 65950855082112. Its totient is φ = 5520901317120.

The previous prime is 21222110201207. The next prime is 21222110201221. The reversal of 21222110201220 is 2210201122212.

It is a happy number.

21222110201220 is a `hidden beast` number, since 2 + 12 + 221 + 10 + 201 + 220 = 666.

It is a super-2 number, since 2×21222110201220² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21222110201193 and 21222110201202.

It is not an unprimeable number, because it can be changed into a prime (21222110201221) 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, 4704240 + ... + 8035800.

Almost surely, 2^{21222110201220} is an apocalyptic number.

21222110201220 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 21222110201220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32975427541056).

21222110201220 is an abundant number, since it is smaller than the sum of its proper divisors (44728744880892).

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

21222110201220 is a wasteful number, since it uses less digits than its factorization.

21222110201220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3332442 (or 3332437 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21222110201220 its reverse (2210201122212), we get a palindrome (23432311323432).

The spelling of 21222110201220 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred ten million, two hundred one thousand, two hundred twenty".