22131201231020 has 144 divisors (see below), whose sum is σ = 54436848076800. Its totient is φ = 7535504704896.

The previous prime is 22131201231011. The next prime is 22131201231047. The reversal of 22131201231020 is 2013210213122.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 22131201230983 and 22131201231001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 180455681 + ... + 180578279.

It is an arithmetic number, because the mean of its divisors is an integer number (378033667200).

Almost surely, 2^{22131201231020} is an apocalyptic number.

22131201231020 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 22131201231020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27218424038400).

22131201231020 is an abundant number, since it is smaller than the sum of its proper divisors (32305646845780).

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

22131201231020 is a wasteful number, since it uses less digits than its factorization.

22131201231020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123892 (or 123883 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 22131201231020 its reverse (2013210213122), we get a palindrome (24144411444142).

The spelling of 22131201231020 in words is "twenty-two trillion, one hundred thirty-one billion, two hundred one million, two hundred thirty-one thousand, twenty".