210001100121 has 16 divisors (see below), whose sum is σ = 311119862400. Its totient is φ = 139997528784.

The previous prime is 210001100107. The next prime is 210001100143. The reversal of 210001100121 is 121001100012.

It is a happy number.

210001100121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 210001100121 - 2¹³ = 210001091929 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (210001104121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2026255 + ... + 2127371.

It is an arithmetic number, because the mean of its divisors is an integer number (19444991400).

Almost surely, 2^210001100121 is an apocalyptic number.

It is an amenable number.

210001100121 is a deficient number, since it is larger than the sum of its proper divisors (101118762279).

210001100121 is a wasteful number, since it uses less digits than its factorization.

210001100121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178045 (or 178039 counting only the distinct ones).

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

Adding to 210001100121 its reverse (121001100012), we get a palindrome (331002200133).

The spelling of 210001100121 in words is "two hundred ten billion, one million, one hundred thousand, one hundred twenty-one".