22121211020 has 96 divisors (see below), whose sum is σ = 49797115200. Its totient is φ = 8239422464.

The previous prime is 22121210999. The next prime is 22121211023. The reversal of 22121211020 is 2011212122.

It is a junction number, because it is equal to n+sod(n) for n = 22121210986 and 22121211004.

It is not an unprimeable number, because it can be changed into a prime (22121211023) 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, 1807562 + ... + 1819758.

It is an arithmetic number, because the mean of its divisors is an integer number (518719950).

Almost surely, 2^22121211020 is an apocalyptic number.

22121211020 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 22121211020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24898557600).

22121211020 is an abundant number, since it is smaller than the sum of its proper divisors (27675904180).

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

22121211020 is a wasteful number, since it uses less digits than its factorization.

22121211020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12347 (or 12345 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 22121211020 its reverse (2011212122), we get a palindrome (24132423142).

It can be divided in two parts, 221212 and 11020, that added together give a palindrome (232232).

The spelling of 22121211020 in words is "twenty-two billion, one hundred twenty-one million, two hundred eleven thousand, twenty".