100221020020 has 24 divisors (see below), whose sum is σ = 229597246368. Its totient is φ = 36444007200.

The previous prime is 100221019981. The next prime is 100221020021. The reversal of 100221020020 is 20020122001.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 100221019979 and 100221020006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100221020021) 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, 227774826 + ... + 227775265.

It is an arithmetic number, because the mean of its divisors is an integer number (9566551932).

Almost surely, 2^100221020020 is an apocalyptic number.

100221020020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100221020020 is an abundant number, since it is smaller than the sum of its proper divisors (129376226348).

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

100221020020 is a wasteful number, since it uses less digits than its factorization.

100221020020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455550111 (or 455550109 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 100221020020 its reverse (20020122001), we get a palindrome (120241142021).

The spelling of 100221020020 in words is "one hundred billion, two hundred twenty-one million, twenty thousand, twenty".