210121110001 has 4 divisors (see below), whose sum is σ = 229223029104. Its totient is φ = 191019190900.

The previous prime is 210121109971. The next prime is 210121110011. The reversal of 210121110001 is 100011121012.

210121110001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 210121110001 - 2¹³ = 210121101809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 210121110001.

It is not an unprimeable number, because it can be changed into a prime (210121110011) 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 3 ways as a sum of consecutive naturals, for example, 9550959535 + ... + 9550959556.

It is an arithmetic number, because the mean of its divisors is an integer number (57305757276).

Almost surely, 2^210121110001 is an apocalyptic number.

It is an amenable number.

210121110001 is a deficient number, since it is larger than the sum of its proper divisors (19101919103).

210121110001 is a wasteful number, since it uses less digits than its factorization.

210121110001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19101919102.

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

Adding to 210121110001 its reverse (100011121012), we get a palindrome (310132231013).

The spelling of 210121110001 in words is "two hundred ten billion, one hundred twenty-one million, one hundred ten thousand, one".