210021011200121 has 4 divisors (see below), whose sum is σ = 229113830400144. Its totient is φ = 190928192000100.

The previous prime is 210021011200009. The next prime is 210021011200129. The reversal of 210021011200121 is 121002110120012.

210021011200121 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 210021011200121 - 2³⁰ = 210019937458297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210021011200096 and 210021011200105.

It is not an unprimeable number, because it can be changed into a prime (210021011200129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9546409599995 + ... + 9546409600016.

It is an arithmetic number, because the mean of its divisors is an integer number (57278457600036).

Almost surely, 2^{210021011200121} is an apocalyptic number.

It is an amenable number.

210021011200121 is a deficient number, since it is larger than the sum of its proper divisors (19092819200023).

210021011200121 is a wasteful number, since it uses less digits than its factorization.

210021011200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19092819200022.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 210021011200121 its reverse (121002110120012), we get a palindrome (331023121320133).

It can be divided in two parts, 2100210 and 11200121, that added together give a palindrome (13300331).

The spelling of 210021011200121 in words is "two hundred ten trillion, twenty-one billion, eleven million, two hundred thousand, one hundred twenty-one".