200121212100 has 144 divisors (see below), whose sum is σ = 587730993920. Its totient is φ = 52565760000.

The previous prime is 200121212041. The next prime is 200121212147. The reversal of 200121212100 is 1212121002.

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

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, 10252350 + ... + 10271850.

Almost surely, 2^200121212100 is an apocalyptic number.

200121212100 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 200121212100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (293865496960).

200121212100 is an abundant number, since it is smaller than the sum of its proper divisors (387609781820).

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

200121212100 is a wasteful number, since it uses less digits than its factorization.

200121212100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20030 (or 20023 counting only the distinct ones).

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

Adding to 200121212100 its reverse (1212121002), we get a palindrome (201333333102).

The spelling of 200121212100 in words is "two hundred billion, one hundred twenty-one million, two hundred twelve thousand, one hundred".