21112201202220 has 384 divisors, whose sum is σ = 67567969566720. Its totient is φ = 5470192465920.

The previous prime is 21112201202149. The next prime is 21112201202243. The reversal of 21112201202220 is 2220210221112.

It is a happy number.

21112201202220 is a `hidden beast` number, since 21 + 1 + 1 + 220 + 1 + 202 + 220 = 666.

It is a super-2 number, since 2×21112201202220² (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 = 21112201202193 and 21112201202202.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1975497717 + ... + 1975508403.

It is an arithmetic number, because the mean of its divisors is an integer number (175958254080).

Almost surely, 2^{21112201202220} is an apocalyptic number.

21112201202220 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 21112201202220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33783984783360).

21112201202220 is an abundant number, since it is smaller than the sum of its proper divisors (46455768364500).

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

21112201202220 is a wasteful number, since it uses less digits than its factorization.

21112201202220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11310 (or 11302 counting only the distinct ones).

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

Adding to 21112201202220 its reverse (2220210221112), we get a palindrome (23332411423332).

The spelling of 21112201202220 in words is "twenty-one trillion, one hundred twelve billion, two hundred one million, two hundred two thousand, two hundred twenty".