201221102222001 has 12 divisors (see below), whose sum is σ = 291046008636240. Its totient is φ = 133965875899800.

The previous prime is 201221102221999. The next prime is 201221102222047. The reversal of 201221102222001 is 100222201122102.

It is a happy number.

201221102222001 is a `hidden beast` number, since 20 + 1 + 221 + 1 + 0 + 222 + 200 + 1 = 666.

It is not a de Polignac number, because 201221102222001 - 2¹ = 201221102221999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (201221102222801) 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, 15127124775 + ... + 15127138076.

It is an arithmetic number, because the mean of its divisors is an integer number (24253834053020).

Almost surely, 2^{201221102222001} is an apocalyptic number.

It is an amenable number.

201221102222001 is a deficient number, since it is larger than the sum of its proper divisors (89824906414239).

201221102222001 is a wasteful number, since it uses less digits than its factorization.

201221102222001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30254263596 (or 30254263593 counting only the distinct ones).

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

Adding to 201221102222001 its reverse (100222201122102), we get a palindrome (301443303344103).

The spelling of 201221102222001 in words is "two hundred one trillion, two hundred twenty-one billion, one hundred two million, two hundred twenty-two thousand, one".