22188100500 has 384 divisors, whose sum is σ = 74063808000. Its totient is φ = 5732812800.

The previous prime is 22188100471. The next prime is 22188100507. The reversal of 22188100500 is 500188122.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22188100507) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 70888344 + ... + 70888656.

It is an arithmetic number, because the mean of its divisors is an integer number (192874500).

Almost surely, 2^22188100500 is an apocalyptic number.

22188100500 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 22188100500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37031904000).

22188100500 is an abundant number, since it is smaller than the sum of its proper divisors (51875707500).

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

22188100500 is a wasteful number, since it uses less digits than its factorization.

22188100500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 471 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

Adding to 22188100500 its reverse (500188122), we get a palindrome (22688288622).

The spelling of 22188100500 in words is "twenty-two billion, one hundred eighty-eight million, one hundred thousand, five hundred".