128101021 has 8 divisors (see below), whose sum is σ = 139193600. Its totient is φ = 117443520.

The previous prime is 128101019. The next prime is 128101031. The reversal of 128101021 is 120101821.

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

It is a cyclic number.

It is not a de Polignac number, because 128101021 - 2¹ = 128101019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128100986 and 128101004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128101031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108156 + ... + 109333.

It is an arithmetic number, because the mean of its divisors is an integer number (17399200).

Almost surely, 2^128101021 is an apocalyptic number.

It is an amenable number.

128101021 is a deficient number, since it is larger than the sum of its proper divisors (11092579).

128101021 is a wasteful number, since it uses less digits than its factorization.

128101021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217539.

The product of its (nonzero) digits is 32, while the sum is 16.

The square root of 128101021 is about 11318.1721580828. The cubic root of 128101021 is about 504.1009668488.

Adding to 128101021 its reverse (120101821), we get a palindrome (248202842).

It can be divided in two parts, 12810 and 1021, that added together give a palindrome (13831).

The spelling of 128101021 in words is "one hundred twenty-eight million, one hundred one thousand, twenty-one".