22121000022 has 48 divisors (see below), whose sum is σ = 48676110336. Its totient is φ = 6696927600.

The previous prime is 22121000009. The next prime is 22121000029. The reversal of 22121000022 is 22000012122.

It is a junction number, because it is equal to n+sod(n) for n = 22120999971 and 22121000007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121000029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 775147 + ... + 803177.

It is an arithmetic number, because the mean of its divisors is an integer number (1014085632).

Almost surely, 2^22121000022 is an apocalyptic number.

22121000022 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 22121000022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24338055168).

22121000022 is an abundant number, since it is smaller than the sum of its proper divisors (26555110314).

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

22121000022 is a wasteful number, since it uses less digits than its factorization.

22121000022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29145 (or 29134 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 22121000022 its reverse (22000012122), we get a palindrome (44121012144).

The spelling of 22121000022 in words is "twenty-two billion, one hundred twenty-one million, twenty-two", and thus it is an aban number.