210121200100 has 36 divisors (see below), whose sum is σ = 521100577984. Its totient is φ = 72041554080.

The previous prime is 210121200097. The next prime is 210121200109. The reversal of 210121200100 is 1002121012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (210121200109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 150085872 + ... + 150087271.

Almost surely, 2^210121200100 is an apocalyptic number.

210121200100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

210121200100 is an abundant number, since it is smaller than the sum of its proper divisors (310979377884).

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

210121200100 is a wasteful number, since it uses less digits than its factorization.

210121200100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300173164 (or 300173157 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 210121200100 its reverse (1002121012), we get a palindrome (211123321112).

The spelling of 210121200100 in words is "two hundred ten billion, one hundred twenty-one million, two hundred thousand, one hundred".