210121200099 has 12 divisors (see below), whose sum is σ = 313298994112. Its totient is φ = 135562064400.

The previous prime is 210121200097. The next prime is 210121200109. The reversal of 210121200099 is 990002121012.

It is not a de Polignac number, because 210121200099 - 2¹ = 210121200097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210121200097) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 376561012 + ... + 376561569.

Almost surely, 2^210121200099 is an apocalyptic number.

210121200099 is a deficient number, since it is larger than the sum of its proper divisors (103177794013).

210121200099 is a wasteful number, since it uses less digits than its factorization.

210121200099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 753122618 (or 753122615 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The spelling of 210121200099 in words is "two hundred ten billion, one hundred twenty-one million, two hundred thousand, ninety-nine".