128200420100 has 18 divisors (see below), whose sum is σ = 278194911834. Its totient is φ = 51280168000.

The previous prime is 128200420081. The next prime is 128200420133. The reversal of 128200420100 is 1024002821.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1861404736 + 126339015364 = 43144^2 + 355442^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 641002001 + ... + 641002200.

Almost surely, 2^128200420100 is an apocalyptic number.

128200420100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128200420100 is an abundant number, since it is smaller than the sum of its proper divisors (149994491734).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128200420100 is a wasteful number, since it uses less digits than its factorization.

128200420100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282004215 (or 1282004208 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 128200420100 its reverse (1024002821), we get a palindrome (129224422921).

The spelling of 128200420100 in words is "one hundred twenty-eight billion, two hundred million, four hundred twenty thousand, one hundred".