22161215340540 has 144 divisors (see below), whose sum is σ = 68544062024256. Its totient is φ = 5794086297600.

The previous prime is 22161215340533. The next prime is 22161215340577. The reversal of 22161215340540 is 4504351216122.

22161215340540 is a `hidden beast` number, since 2 + 2 + 1 + 6 + 1 + 21 + 53 + 40 + 540 = 666.

It is a super-2 number, since 2×22161215340540² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 22161215340495 and 22161215340504.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 169884 + ... + 6659676.

It is an arithmetic number, because the mean of its divisors is an integer number (476000430724).

Almost surely, 2^{22161215340540} is an apocalyptic number.

22161215340540 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 22161215340540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34272031012128).

22161215340540 is an abundant number, since it is smaller than the sum of its proper divisors (46382846683716).

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

22161215340540 is a wasteful number, since it uses less digits than its factorization.

22161215340540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6490180 (or 6490175 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

Adding to 22161215340540 its reverse (4504351216122), we get a palindrome (26665566556662).

The spelling of 22161215340540 in words is "twenty-two trillion, one hundred sixty-one billion, two hundred fifteen million, three hundred forty thousand, five hundred forty".