210221112020121 has 24 divisors (see below), whose sum is σ = 304809337609920. Its totient is φ = 139613590444896.

The previous prime is 210221112020089. The next prime is 210221112020137. The reversal of 210221112020121 is 121020211122012.

210221112020121 is a `hidden beast` number, since 210 + 2 + 211 + 1 + 20 + 201 + 21 = 666.

It is not a de Polignac number, because 210221112020121 - 2⁵ = 210221112020089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210221112020094 and 210221112020103.

It is not an unprimeable number, because it can be changed into a prime (210221112020021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 677936050 + ... + 678246068.

It is an arithmetic number, because the mean of its divisors is an integer number (12700389067080).

Almost surely, 2^{210221112020121} is an apocalyptic number.

It is an amenable number.

210221112020121 is a deficient number, since it is larger than the sum of its proper divisors (94588225589799).

210221112020121 is a wasteful number, since it uses less digits than its factorization.

210221112020121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596765 (or 596762 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 210221112020121 its reverse (121020211122012), we get a palindrome (331241323142133).

The spelling of 210221112020121 in words is "two hundred ten trillion, two hundred twenty-one billion, one hundred twelve million, twenty thousand, one hundred twenty-one".