22221211020 has 96 divisors (see below), whose sum is σ = 65910801600. Its totient is φ = 5574426624.

The previous prime is 22221210997. The next prime is 22221211063. The reversal of 22221211020 is 2011212222.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2963436 + ... + 2970924.

It is an arithmetic number, because the mean of its divisors is an integer number (686570850).

Almost surely, 2^22221211020 is an apocalyptic number.

22221211020 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 22221211020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32955400800).

22221211020 is an abundant number, since it is smaller than the sum of its proper divisors (43689590580).

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

22221211020 is a wasteful number, since it uses less digits than its factorization.

22221211020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10427 (or 10425 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 22221211020 its reverse (2011212222), we get a palindrome (24232423242).

The spelling of 22221211020 in words is "twenty-two billion, two hundred twenty-one million, two hundred eleven thousand, twenty".