22131135220 has 12 divisors (see below), whose sum is σ = 46475384004. Its totient is φ = 8852454080.

The previous prime is 22131135203. The next prime is 22131135223. The reversal of 22131135220 is 2253113122.

It can be written as a sum of positive squares in 2 ways, for example, as 11061570276 + 11069564944 = 105174^2 + 105212^2 .

It is a super-2 number, since 2×22131135220² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22131135191 and 22131135200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22131135223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 553278361 + ... + 553278400.

It is an arithmetic number, because the mean of its divisors is an integer number (3872948667).

Almost surely, 2^22131135220 is an apocalyptic number.

22131135220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22131135220 is an abundant number, since it is smaller than the sum of its proper divisors (24344248784).

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

22131135220 is a wasteful number, since it uses less digits than its factorization.

22131135220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106556770 (or 1106556768 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 22131135220 its reverse (2253113122), we get a palindrome (24384248342).

The spelling of 22131135220 in words is "twenty-two billion, one hundred thirty-one million, one hundred thirty-five thousand, two hundred twenty".