22021111020 has 96 divisors (see below), whose sum is σ = 64691859456. Its totient is φ = 5589676800.

The previous prime is 22021111009. The next prime is 22021111027. The reversal of 22021111020 is 2011112022.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 22021110987 and 22021111005.

It is not an unprimeable number, because it can be changed into a prime (22021111027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16417 + ... + 210503.

It is an arithmetic number, because the mean of its divisors is an integer number (673873536).

Almost surely, 2^22021111020 is an apocalyptic number.

22021111020 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 22021111020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32345929728).

22021111020 is an abundant number, since it is smaller than the sum of its proper divisors (42670748436).

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

22021111020 is a wasteful number, since it uses less digits than its factorization.

22021111020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194191 (or 194189 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 22021111020 its reverse (2011112022), we get a palindrome (24032223042).

The spelling of 22021111020 in words is "twenty-two billion, twenty-one million, one hundred eleven thousand, twenty".