201221122001 has 4 divisors (see below), whose sum is σ = 201222623232. Its totient is φ = 201219620772.

The previous prime is 201221121917. The next prime is 201221122007. The reversal of 201221122001 is 100221122102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 100221122102 = 2 ⋅50110561051.

It is a cyclic number.

It is not a de Polignac number, because 201221122001 - 2²² = 201216927697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201221122007) 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 3 ways as a sum of consecutive naturals, for example, 527441 + ... + 825006.

It is an arithmetic number, because the mean of its divisors is an integer number (50305655808).

Almost surely, 2^201221122001 is an apocalyptic number.

It is an amenable number.

201221122001 is a deficient number, since it is larger than the sum of its proper divisors (1501231).

201221122001 is a wasteful number, since it uses less digits than its factorization.

201221122001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1501230.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 201221122001 its reverse (100221122102), we get a palindrome (301442244103).

The spelling of 201221122001 in words is "two hundred one billion, two hundred twenty-one million, one hundred twenty-two thousand, one".