2165521226 has 8 divisors (see below), whose sum is σ = 3543580224. Its totient is φ = 984327820.

The previous prime is 2165521201. The next prime is 2165521243. The reversal of 2165521226 is 6221255612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 2165521192 and 2165521201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49216370 + ... + 49216413.

It is an arithmetic number, because the mean of its divisors is an integer number (442947528).

Almost surely, 2^2165521226 is an apocalyptic number.

2165521226 is a deficient number, since it is larger than the sum of its proper divisors (1378058998).

2165521226 is a wasteful number, since it uses less digits than its factorization.

2165521226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98432796.

The product of its digits is 14400, while the sum is 32.

The square root of 2165521226 is about 46535.1611794780. The cubic root of 2165521226 is about 1293.7612769879.

Adding to 2165521226 its reverse (6221255612), we get a palindrome (8386776838).

The spelling of 2165521226 in words is "two billion, one hundred sixty-five million, five hundred twenty-one thousand, two hundred twenty-six".