20012221100200 has 144 divisors (see below), whose sum is σ = 53247454935840. Its totient is φ = 6852039129600.

The previous prime is 20012221100197. The next prime is 20012221100203. The reversal of 20012221100200 is 200112221002.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (20012221100197) and next prime (20012221100203).

It is not an unprimeable number, because it can be changed into a prime (20012221100203) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 810757059 + ... + 810781741.

It is an arithmetic number, because the mean of its divisors is an integer number (369773992610).

Almost surely, 2^{20012221100200} is an apocalyptic number.

20012221100200 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 20012221100200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26623727467920).

20012221100200 is an abundant number, since it is smaller than the sum of its proper divisors (33235233835640).

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

20012221100200 is an equidigital number, since it uses as much as digits as its factorization.

20012221100200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26228 (or 25458 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20012221100200 its reverse (200112221002), we get a palindrome (20212333321202).

The spelling of 20012221100200 in words is "twenty trillion, twelve billion, two hundred twenty-one million, one hundred thousand, two hundred".