210221020121 has 8 divisors (see below), whose sum is σ = 242144348160. Its totient is φ = 178770630528.

The previous prime is 210221020049. The next prime is 210221020157. The reversal of 210221020121 is 121020122012.

210221020121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 210221020121 - 2²⁶ = 210153911257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210221020096 and 210221020105.

It is not an unprimeable number, because it can be changed into a prime (210221020181) 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 7 ways as a sum of consecutive naturals, for example, 118233656 + ... + 118235433.

It is an arithmetic number, because the mean of its divisors is an integer number (30268043520).

Almost surely, 2^210221020121 is an apocalyptic number.

It is an amenable number.

210221020121 is a deficient number, since it is larger than the sum of its proper divisors (31923328039).

210221020121 is a wasteful number, since it uses less digits than its factorization.

210221020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236469223.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 210221020121 its reverse (121020122012), we get a palindrome (331241142133).

The spelling of 210221020121 in words is "two hundred ten billion, two hundred twenty-one million, twenty thousand, one hundred twenty-one".