221212112201 has 16 divisors (see below), whose sum is σ = 231843897600. Its totient is φ = 210783081600.

The previous prime is 221212112167. The next prime is 221212112237. The reversal of 221212112201 is 102211212122.

It is a cyclic number.

It is not a de Polignac number, because 221212112201 - 2¹⁰ = 221212111177 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 221212112201.

It is not an unprimeable number, because it can be changed into a prime (221212111201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5204606 + ... + 5246936.

It is an arithmetic number, because the mean of its divisors is an integer number (14490243600).

Almost surely, 2^221212112201 is an apocalyptic number.

It is an amenable number.

221212112201 is a deficient number, since it is larger than the sum of its proper divisors (10631785399).

221212112201 is a wasteful number, since it uses less digits than its factorization.

221212112201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44720.

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

Adding to 221212112201 its reverse (102211212122), we get a palindrome (323423324323).

The spelling of 221212112201 in words is "two hundred twenty-one billion, two hundred twelve million, one hundred twelve thousand, two hundred one".