100220128 has 12 divisors (see below), whose sum is σ = 197308440. Its totient is φ = 50110048.

The previous prime is 100220119. The next prime is 100220129. The reversal of 100220128 is 821022001.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100220129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1565908 + ... + 1565971.

It is an arithmetic number, because the mean of its divisors is an integer number (16442370).

Almost surely, 2^100220128 is an apocalyptic number.

It is an amenable number.

100220128 is a deficient number, since it is larger than the sum of its proper divisors (97088312).

100220128 is an equidigital number, since it uses as much as digits as its factorization.

100220128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3131889 (or 3131881 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 100220128 is about 10011.0003496154. Note that the first 3 decimals coincide. The cubic root of 100220128 is about 464.4992149838.

Adding to 100220128 its reverse (821022001), we get a palindrome (921242129).

The spelling of 100220128 in words is "one hundred million, two hundred twenty thousand, one hundred twenty-eight".