22131215305500 has 96 divisors (see below), whose sum is σ = 73652684571648. Its totient is φ = 5058563496000.

The previous prime is 22131215305477. The next prime is 22131215305513. The reversal of 22131215305500 is 550351213122.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1053856896 + ... + 1053877895.

It is an arithmetic number, because the mean of its divisors is an integer number (767215464288).

Almost surely, 2^{22131215305500} is an apocalyptic number.

22131215305500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22131215305500 is an abundant number, since it is smaller than the sum of its proper divisors (51521469266148).

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

22131215305500 is a wasteful number, since it uses less digits than its factorization.

22131215305500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2107734820 (or 2107734808 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 30.

Adding to 22131215305500 its reverse (550351213122), we get a palindrome (22681566518622).

The spelling of 22131215305500 in words is "twenty-two trillion, one hundred thirty-one billion, two hundred fifteen million, three hundred five thousand, five hundred".