100220120 has 128 divisors (see below), whose sum is σ = 302883840. Its totient is φ = 28823040.

The previous prime is 100220119. The next prime is 100220129. The reversal of 100220120 is 21022001.

Added to its reverse (21022001) it gives a square (121242121 = 11011²).

100220120 = 2³ + 3³ + ... + 141³.

It is a Cunningham number, because it is equal to 10011²-1.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a junction number, because it is equal to n+sod(n) for n = 100220098 and 100220107.

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 in 31 ways as a sum of consecutive naturals, for example, 38789 + ... + 41291.

It is an arithmetic number, because the mean of its divisors is an integer number (2366280).

Almost surely, 2^100220120 is an apocalyptic number.

100220120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 100220120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (151441920).

100220120 is an abundant number, since it is smaller than the sum of its proper divisors (202663720).

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

100220120 is a wasteful number, since it uses less digits than its factorization.

100220120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2545 (or 2541 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

The square root of 100220120 is about 10010.9999500549. Note that the first 4 decimals coincide. The cubic root of 100220120 is about 464.4992026244.

Adding to 100220120 its reverse (21022001), we get a palindrome (121242121).

The spelling of 100220120 in words is "one hundred million, two hundred twenty thousand, one hundred twenty".