221021120210121 has 36 divisors (see below), whose sum is σ = 405137044104624. Its totient is φ = 114816166340400.

The previous prime is 221021120210119. The next prime is 221021120210153. The reversal of 221021120210121 is 121012021120122.

221021120210121 is a `hidden beast` number, since 2 + 210 + 2 + 1 + 120 + 210 + 121 = 666.

It is not a de Polignac number, because 221021120210121 - 2¹ = 221021120210119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221021120210094 and 221021120210103.

It is not an unprimeable number, because it can be changed into a prime (221021120210171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 22780980535 + ... + 22780990236.

It is an arithmetic number, because the mean of its divisors is an integer number (11253806780684).

Almost surely, 2^{221021120210121} is an apocalyptic number.

221021120210121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

221021120210121 is a deficient number, since it is larger than the sum of its proper divisors (184115923894503).

221021120210121 is a wasteful number, since it uses less digits than its factorization.

221021120210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45561970802 (or 45561970792 counting only the distinct ones).

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

Adding to 221021120210121 its reverse (121012021120122), we get a palindrome (342033141330243).

The spelling of 221021120210121 in words is "two hundred twenty-one trillion, twenty-one billion, one hundred twenty million, two hundred ten thousand, one hundred twenty-one".