22221000000 has 392 divisors, whose sum is σ = 81755203520. Its totient is φ = 5918400000.

The previous prime is 22220999987. The next prime is 22221000007. The reversal of 22221000000 is 12222.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22221000007) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 26999589 + ... + 27000411.

Almost surely, 2^22221000000 is an apocalyptic number.

22221000000 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 22221000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40877601760).

22221000000 is an abundant number, since it is smaller than the sum of its proper divisors (59534203520).

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

22221000000 is an frugal number, since it uses more digits than its factorization.

22221000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 874 (or 833 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

Adding to 22221000000 its reverse (12222), we get a palindrome (22221012222).

The spelling of 22221000000 in words is "twenty-two billion, two hundred twenty-one million", and thus it is an aban number.