20012201021100 has 72 divisors (see below), whose sum is σ = 57903834420880. Its totient is φ = 5336414945280.

The previous prime is 20012201021053. The next prime is 20012201021167. The reversal of 20012201021100 is 112010221002.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8387484 + ... + 10505916.

Almost surely, 2^{20012201021100} is an apocalyptic number.

20012201021100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20012201021100 is an abundant number, since it is smaller than the sum of its proper divisors (37891633399780).

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

20012201021100 is a wasteful number, since it uses less digits than its factorization.

20012201021100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2149939 (or 2149932 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 20012201021100 its reverse (112010221002), we get a palindrome (20124211242102).

The spelling of 20012201021100 in words is "twenty trillion, twelve billion, two hundred one million, twenty-one thousand, one hundred".