21210200100121 has 32 divisors (see below), whose sum is σ = 23268724272000. Its totient is φ = 19256280325632.

The previous prime is 21210200100079. The next prime is 21210200100211. The reversal of 21210200100121 is 12100100201212.

It is a cyclic number.

It is not a de Polignac number, because 21210200100121 - 2³⁹ = 20660444286233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210200100821) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 564397510 + ... + 564435088.

It is an arithmetic number, because the mean of its divisors is an integer number (727147633500).

Almost surely, 2^{21210200100121} is an apocalyptic number.

It is an amenable number.

21210200100121 is a deficient number, since it is larger than the sum of its proper divisors (2058524171879).

21210200100121 is a wasteful number, since it uses less digits than its factorization.

21210200100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45241.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21210200100121 its reverse (12100100201212), we get a palindrome (33310300301333).

The spelling of 21210200100121 in words is "twenty-one trillion, two hundred ten billion, two hundred million, one hundred thousand, one hundred twenty-one".