201221101223 has 4 divisors (see below), whose sum is σ = 201330999888. Its totient is φ = 201111202560.

The previous prime is 201221101181. The next prime is 201221101243. The reversal of 201221101223 is 322101122102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 201221101223 - 2¹² = 201221097127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221101243) 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, 54946586 + ... + 54950247.

It is an arithmetic number, because the mean of its divisors is an integer number (50332749972).

Almost surely, 2^201221101223 is an apocalyptic number.

201221101223 is a deficient number, since it is larger than the sum of its proper divisors (109898665).

201221101223 is a wasteful number, since it uses less digits than its factorization.

201221101223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109898664.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 201221101223 its reverse (322101122102), we get a palindrome (523322223325).

The spelling of 201221101223 in words is "two hundred one billion, two hundred twenty-one million, one hundred one thousand, two hundred twenty-three".