22121224000 has 112 divisors (see below), whose sum is σ = 55712928960. Its totient is φ = 8698329600.

The previous prime is 22121223959. The next prime is 22121224019. The reversal of 22121224000 is 42212122.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 448567 + ... + 495433.

Almost surely, 2^22121224000 is an apocalyptic number.

22121224000 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 22121224000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27856464480).

22121224000 is an abundant number, since it is smaller than the sum of its proper divisors (33591704960).

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

22121224000 is an equidigital number, since it uses as much as digits as its factorization.

22121224000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46953 (or 46933 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 22121224000 its reverse (42212122), we get a palindrome (22163436122).

It can be divided in two parts, 2212122 and 4000, that added together give a palindrome (2216122).

The spelling of 22121224000 in words is "twenty-two billion, one hundred twenty-one million, two hundred twenty-four thousand".