200121110100 has 54 divisors (see below), whose sum is σ = 627268504590. Its totient is φ = 53365629120.

The previous prime is 200121110099. The next prime is 200121110107. The reversal of 200121110100 is 1011121002.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 45969075216 + 154152034884 = 214404^2 + 392622^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200121110107) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 111177495 + ... + 111179294.

Almost surely, 2^200121110100 is an apocalyptic number.

200121110100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

200121110100 is an abundant number, since it is smaller than the sum of its proper divisors (427147394490).

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

200121110100 is a wasteful number, since it uses less digits than its factorization.

200121110100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222356809 (or 222356799 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 200121110100 its reverse (1011121002), we get a palindrome (201132231102).

The spelling of 200121110100 in words is "two hundred billion, one hundred twenty-one million, one hundred ten thousand, one hundred".