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116128021 = 284340847

116128021 has 4 divisors (see below), whose sum is σ = 116171712. Its totient is φ = 116084332.

The previous prime is 116128009. The next prime is 116128043. The reversal of 116128021 is 120821611.

Adding to 116128021 its reverse (120821611), we get a palindrome (236949632).

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 116128021 - 215 = 116095253 is a prime.

It is a super-2 number, since 2×1161280212 = 26971434522752882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 116127983 and 116128001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (116128121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17581 + ... + 23266.

It is an arithmetic number, because the mean of its divisors is an integer number (29042928).

It is a 2658-hyperperfect number.

Almost surely, 2116128021 is an apocalyptic number.

It is an amenable number.

116128021 is a deficient number, since it is larger than the sum of its proper divisors (43691).

116128021 is an equidigital number, since it uses as much as digits as its factorization.

116128021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43690.

The product of its (nonzero) digits is 192, while the sum is 22.

The square root of 116128021 is about 10776.2712011159. The cubic root of 116128021 is about 487.8792434458.

The spelling of 116128021 in words is "one hundred sixteen million, one hundred twenty-eight thousand, twenty-one".

Divisors: 1 2843 40847 116128021