22155100520 has 128 divisors (see below), whose sum is σ = 59843543040. Its totient is φ = 7217337600.

The previous prime is 22155100477. The next prime is 22155100523. The reversal of 22155100520 is 2500155122.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is not an unprimeable number, because it can be changed into a prime (22155100523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 961049 + ... + 983831.

It is an arithmetic number, because the mean of its divisors is an integer number (467527680).

Almost surely, 2^22155100520 is an apocalyptic number.

22155100520 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 22155100520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29921771520).

22155100520 is an abundant number, since it is smaller than the sum of its proper divisors (37688442520).

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

22155100520 is a wasteful number, since it uses less digits than its factorization.

22155100520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22975 (or 22971 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

Adding to 22155100520 its reverse (2500155122), we get a palindrome (24655255642).

The spelling of 22155100520 in words is "twenty-two billion, one hundred fifty-five million, one hundred thousand, five hundred twenty".