221210121212201 has 16 divisors (see below), whose sum is σ = 244772315375616. Its totient is φ = 198224524890000.

The previous prime is 221210121212147. The next prime is 221210121212209. The reversal of 221210121212201 is 102212121012122.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221210121212201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221210121212209) 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, 27261695 + ... + 34432836.

It is an arithmetic number, because the mean of its divisors is an integer number (15298269710976).

Almost surely, 2^{221210121212201} is an apocalyptic number.

It is an amenable number.

221210121212201 is a deficient number, since it is larger than the sum of its proper divisors (23562194163415).

221210121212201 is a wasteful number, since it uses less digits than its factorization.

221210121212201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61699204.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 221210121212201 its reverse (102212121012122), we get a palindrome (323422242224323).

The spelling of 221210121212201 in words is "two hundred twenty-one trillion, two hundred ten billion, one hundred twenty-one million, two hundred twelve thousand, two hundred one".