221201002210121 has 16 divisors (see below), whose sum is σ = 238051056687360. Its totient is φ = 204881254381440.

The previous prime is 221201002210117. The next prime is 221201002210127. The reversal of 221201002210121 is 121012200102122.

It is a cyclic number.

It is not a de Polignac number, because 221201002210121 - 2² = 221201002210117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 221201002210121.

It is not an unprimeable number, because it can be changed into a prime (221201002210127) 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, 131343350 + ... + 133016831.

It is an arithmetic number, because the mean of its divisors is an integer number (14878191042960).

Almost surely, 2^{221201002210121} is an apocalyptic number.

It is an amenable number.

221201002210121 is a deficient number, since it is larger than the sum of its proper divisors (16850054477239).

221201002210121 is a wasteful number, since it uses less digits than its factorization.

221201002210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264361184.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221201002210121 its reverse (121012200102122), we get a palindrome (342213202312243).

The spelling of 221201002210121 in words is "two hundred twenty-one trillion, two hundred one billion, two million, two hundred ten thousand, one hundred twenty-one".