221201200010121 has 16 divisors (see below), whose sum is σ = 312285833275968. Its totient is φ = 138792115942400.

The previous prime is 221201200010081. The next prime is 221201200010177. The reversal of 221201200010121 is 121010002102122.

It is a cyclic number.

It is not a de Polignac number, because 221201200010121 - 2¹⁸ = 221201199747977 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221201200010121.

It is not an unprimeable number, because it can be changed into a prime (221201200010521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3336015 + ... + 21296276.

It is an arithmetic number, because the mean of its divisors is an integer number (19517864579748).

Almost surely, 2^{221201200010121} is an apocalyptic number.

It is an amenable number.

221201200010121 is a deficient number, since it is larger than the sum of its proper divisors (91084633265847).

221201200010121 is a wasteful number, since it uses less digits than its factorization.

221201200010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24808392.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221201200010121 its reverse (121010002102122), we get a palindrome (342211202112243).

The spelling of 221201200010121 in words is "two hundred twenty-one trillion, two hundred one billion, two hundred million, ten thousand, one hundred twenty-one".