20010221100 has 144 divisors (see below), whose sum is σ = 65235824640. Its totient is φ = 5260852800.

The previous prime is 20010221069. The next prime is 20010221111. The reversal of 20010221100 is 112201002.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 139509 + ... + 243891.

It is an arithmetic number, because the mean of its divisors is an integer number (453026560).

Almost surely, 2^20010221100 is an apocalyptic number.

20010221100 is a gapful number since it is divisible by the number (20) 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 20010221100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32617912320).

20010221100 is an abundant number, since it is smaller than the sum of its proper divisors (45225603540).

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

20010221100 is a wasteful number, since it uses less digits than its factorization.

20010221100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104477 (or 104464 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 20010221100 its reverse (112201002), we get a palindrome (20122422102).

The spelling of 20010221100 in words is "twenty billion, ten million, two hundred twenty-one thousand, one hundred".