128210105 has 8 divisors (see below), whose sum is σ = 156374664. Its totient is φ = 100886400.

The previous prime is 128210101. The next prime is 128210111. The reversal of 128210105 is 501012821.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10942864 + 117267241 = 3308^2 + 10829^2 .

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

It is not a de Polignac number, because 128210105 - 2² = 128210101 is a prime.

It is a super-2 number, since 2×128210105² = 32875662048222050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128210101) 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, 209876 + ... + 210485.

It is an arithmetic number, because the mean of its divisors is an integer number (19546833).

Almost surely, 2^128210105 is an apocalyptic number.

It is an amenable number.

128210105 is a deficient number, since it is larger than the sum of its proper divisors (28164559).

128210105 is an equidigital number, since it uses as much as digits as its factorization.

128210105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420427.

The product of its (nonzero) digits is 160, while the sum is 20.

The square root of 128210105 is about 11322.9901086241. The cubic root of 128210105 is about 504.2440147552.

Adding to 128210105 its reverse (501012821), we get a palindrome (629222926).

The spelling of 128210105 in words is "one hundred twenty-eight million, two hundred ten thousand, one hundred five".