21112021022220 has 144 divisors (see below), whose sum is σ = 64793670640608. Its totient is φ = 5563765739520.

The previous prime is 21112021022153. The next prime is 21112021022237. The reversal of 21112021022220 is 2222012021112.

It is a happy number.

21112021022220 is a `hidden beast` number, since 211 + 1 + 2 + 0 + 210 + 22 + 220 = 666.

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 = 21112021022193 and 21112021022202.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11189922 + ... + 12939798.

Almost surely, 2^{21112021022220} is an apocalyptic number.

21112021022220 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 21112021022220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32396835320304).

21112021022220 is an abundant number, since it is smaller than the sum of its proper divisors (43681649618388).

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

21112021022220 is a wasteful number, since it uses less digits than its factorization.

21112021022220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1750680 (or 1750675 counting only the distinct ones).

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

Adding to 21112021022220 its reverse (2222012021112), we get a palindrome (23334033043332).

The spelling of 21112021022220 in words is "twenty-one trillion, one hundred twelve billion, twenty-one million, twenty-two thousand, two hundred twenty".