221222221210121 has 16 divisors (see below), whose sum is σ = 225832874072064. Its totient is φ = 216660668241024.

The previous prime is 221222221210097. The next prime is 221222221210129. The reversal of 221222221210121 is 121012122222122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221222221210121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221222221210129) 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 15 ways as a sum of consecutive naturals, for example, 4556261 + ... + 21522173.

It is an arithmetic number, because the mean of its divisors is an integer number (14114554629504).

Almost surely, 2^{221222221210121} is an apocalyptic number.

It is an amenable number.

221222221210121 is a deficient number, since it is larger than the sum of its proper divisors (4610652861943).

221222221210121 is a wasteful number, since it uses less digits than its factorization.

221222221210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16967360.

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 221222221210121 its reverse (121012122222122), we get a palindrome (342234343432243).

The spelling of 221222221210121 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, two hundred twenty-one million, two hundred ten thousand, one hundred twenty-one".