221201112021 has 16 divisors (see below), whose sum is σ = 304057801344. Its totient is φ = 142936225344.

The previous prime is 221201112007. The next prime is 221201112043. The reversal of 221201112021 is 120211102122.

221201112021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 221201112021 - 2¹⁰ = 221201110997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221201112721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3759406 + ... + 3817791.

It is an arithmetic number, because the mean of its divisors is an integer number (19003612584).

Almost surely, 2^221201112021 is an apocalyptic number.

It is an amenable number.

221201112021 is a deficient number, since it is larger than the sum of its proper divisors (82856689323).

221201112021 is a wasteful number, since it uses less digits than its factorization.

221201112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7577500.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 221201112021 its reverse (120211102122), we get a palindrome (341412214143).

The spelling of 221201112021 in words is "two hundred twenty-one billion, two hundred one million, one hundred twelve thousand, twenty-one".