8775123501221 has 32 divisors (see below), whose sum is σ = 11237519480832. Its totient is φ = 6652114148160.

The previous prime is 8775123501173. The next prime is 8775123501223. The reversal of 8775123501221 is 1221053215778.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 8775123501221 - 2³⁸ = 8500245594277 is a prime.

It is a super-2 number, since 2×8775123501221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8775123501223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22849430 + ... + 23230296.

It is an arithmetic number, because the mean of its divisors is an integer number (351172483776).

Almost surely, 2^{8775123501221} is an apocalyptic number.

It is an amenable number.

8775123501221 is a deficient number, since it is larger than the sum of its proper divisors (2462395979611).

8775123501221 is a wasteful number, since it uses less digits than its factorization.

8775123501221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389009.

The product of its (nonzero) digits is 235200, while the sum is 44.

Adding to 8775123501221 its reverse (1221053215778), we get a palindrome (9996176716999).

The spelling of 8775123501221 in words is "eight trillion, seven hundred seventy-five billion, one hundred twenty-three million, five hundred one thousand, two hundred twenty-one".