200121111100 has 18 divisors (see below), whose sum is σ = 434262811304. Its totient is φ = 80048444400.

The previous prime is 200121111097. The next prime is 200121111131. The reversal of 200121111100 is 1111121002.

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 5 ways as a sum of consecutive naturals, for example, 1000605456 + ... + 1000605655.

Almost surely, 2^200121111100 is an apocalyptic number.

200121111100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

200121111100 is an abundant number, since it is smaller than the sum of its proper divisors (234141700204).

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

200121111100 is a wasteful number, since it uses less digits than its factorization.

200121111100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2001211125 (or 2001211118 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 200121111100 its reverse (1111121002), we get a palindrome (201232232102).

The spelling of 200121111100 in words is "two hundred billion, one hundred twenty-one million, one hundred eleven thousand, one hundred".