221212212201 has 12 divisors (see below), whose sum is σ = 319532923840. Its totient is φ = 147472882200.

The previous prime is 221212212161. The next prime is 221212212253. The reversal of 221212212201 is 102212212122.

It is a happy number.

221212212201 is a `hidden beast` number, since 221 + 2 + 1 + 221 + 220 + 1 = 666.

It is not a de Polignac number, because 221212212201 - 2⁷ = 221212212073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221212212101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1037940 + ... + 1232778.

Almost surely, 2^221212212201 is an apocalyptic number.

It is an amenable number.

221212212201 is a deficient number, since it is larger than the sum of its proper divisors (98320711639).

221212212201 is a wasteful number, since it uses less digits than its factorization.

221212212201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320996 (or 320993 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221212212201 its reverse (102212212122), we get a palindrome (323424424323).

It can be divided in two parts, 22121 and 2212201, that added together give a palindrome (2234322).

The spelling of 221212212201 in words is "two hundred twenty-one billion, two hundred twelve million, two hundred twelve thousand, two hundred one".