210221102120121 has 24 divisors (see below), whose sum is σ = 304252213172544. Its totient is φ = 139870833511200.

The previous prime is 210221102120041. The next prime is 210221102120123. The reversal of 210221102120121 is 121021201122012.

210221102120121 is a `hidden beast` number, since 210 + 2 + 211 + 0 + 2 + 120 + 121 = 666.

It is not a de Polignac number, because 210221102120121 - 2²⁶ = 210221035011257 is a prime.

It is a super-2 number, since 2×210221102120121² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 210221102120094 and 210221102120103.

It is not an unprimeable number, because it can be changed into a prime (210221102120123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14176540 + ... + 24928226.

It is an arithmetic number, because the mean of its divisors is an integer number (12677175548856).

Almost surely, 2^{210221102120121} is an apocalyptic number.

It is an amenable number.

210221102120121 is a deficient number, since it is larger than the sum of its proper divisors (94031111052423).

210221102120121 is a wasteful number, since it uses less digits than its factorization.

210221102120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10755981 (or 10755978 counting only the distinct ones).

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

Adding to 210221102120121 its reverse (121021201122012), we get a palindrome (331242303242133).

The spelling of 210221102120121 in words is "two hundred ten trillion, two hundred twenty-one billion, one hundred two million, one hundred twenty thousand, one hundred twenty-one".