22161361251240 has 144 divisors (see below), whose sum is σ = 72469033820820. Its totient is φ = 5873437992960.

The previous prime is 22161361251203. The next prime is 22161361251269. The reversal of 22161361251240 is 4215216316122.

22161361251240 is a `hidden beast` number, since 2 + 2 + 1 + 6 + 1 + 361 + 2 + 51 + 240 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20601595054404 + 1559766196836 = 4538898^2 + 1248906^2 .

It is a super-2 number, since 2×22161361251240² (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 = 22161361251195 and 22161361251204.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 8406360 + ... + 10723320.

Almost surely, 2^{22161361251240} is an apocalyptic number.

22161361251240 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 22161361251240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36234516910410).

22161361251240 is an abundant number, since it is smaller than the sum of its proper divisors (50307672569580).

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

22161361251240 is a wasteful number, since it uses less digits than its factorization.

22161361251240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2317304 (or 2317134 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

Adding to 22161361251240 its reverse (4215216316122), we get a palindrome (26376577567362).

The spelling of 22161361251240 in words is "twenty-two trillion, one hundred sixty-one billion, three hundred sixty-one million, two hundred fifty-one thousand, two hundred forty".