100221200020 has 12 divisors (see below), whose sum is σ = 210464520084. Its totient is φ = 40088480000.

The previous prime is 100221199973. The next prime is 100221200077. The reversal of 100221200020 is 20002122001.

It can be written as a sum of positive squares in 2 ways, for example, as 55034344836 + 45186855184 = 234594^2 + 212572^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2505529981 + ... + 2505530020.

It is an arithmetic number, because the mean of its divisors is an integer number (17538710007).

Almost surely, 2^100221200020 is an apocalyptic number.

100221200020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

100221200020 is an abundant number, since it is smaller than the sum of its proper divisors (110243320064).

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

100221200020 is a wasteful number, since it uses less digits than its factorization.

100221200020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5011060010 (or 5011060008 counting only the distinct ones).

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

Adding to 100221200020 its reverse (20002122001), we get a palindrome (120223322021).

The spelling of 100221200020 in words is "one hundred billion, two hundred twenty-one million, two hundred thousand, twenty".