128122102112021 has 32 divisors (see below), whose sum is σ = 133877826846720. Its totient is φ = 122503376923200.

The previous prime is 128122102112003. The next prime is 128122102112029. The reversal of 128122102112021 is 120211201221821.

It is a happy number.

It is not a de Polignac number, because 128122102112021 - 2⁶ = 128122102111957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128122102112029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6256257260 + ... + 6256277738.

It is an arithmetic number, because the mean of its divisors is an integer number (4183682088960).

Almost surely, 2^{128122102112021} is an apocalyptic number.

It is an amenable number.

128122102112021 is a deficient number, since it is larger than the sum of its proper divisors (5755724734699).

128122102112021 is a wasteful number, since it uses less digits than its factorization.

128122102112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26657.

The product of its (nonzero) digits is 512, while the sum is 26.

Adding to 128122102112021 its reverse (120211201221821), we get a palindrome (248333303333842).

The spelling of 128122102112021 in words is "one hundred twenty-eight trillion, one hundred twenty-two billion, one hundred two million, one hundred twelve thousand, twenty-one".