440121002166521 has 12 divisors (see below), whose sum is σ = 491954302103040. Its totient is φ = 393160200441840.

The previous prime is 440121002166493. The next prime is 440121002166539. The reversal of 440121002166521 is 125661200121044.

It is not a de Polignac number, because 440121002166521 - 2⁴⁶ = 369752257988857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (440121002166721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42004289681 + ... + 42004300158.

It is an arithmetic number, because the mean of its divisors is an integer number (40996191841920).

Almost surely, 2^{440121002166521} is an apocalyptic number.

It is an amenable number.

440121002166521 is a deficient number, since it is larger than the sum of its proper divisors (51833299936519).

440121002166521 is a wasteful number, since it uses less digits than its factorization.

440121002166521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84008589896 (or 84008589883 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

Adding to 440121002166521 its reverse (125661200121044), we get a palindrome (565782202287565).

The spelling of 440121002166521 in words is "four hundred forty trillion, one hundred twenty-one billion, two million, one hundred sixty-six thousand, five hundred twenty-one".