221211121210221 has 16 divisors (see below), whose sum is σ = 308761615319040. Its totient is φ = 140608588145520.

The previous prime is 221211121210117. The next prime is 221211121210279. The reversal of 221211121210221 is 122012121112122.

221211121210221 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 221211121210221 - 2¹⁷ = 221211121079149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221211121210721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5154252301 + ... + 5154295218.

It is an arithmetic number, because the mean of its divisors is an integer number (19297600957440).

Almost surely, 2^{221211121210221} is an apocalyptic number.

It is an amenable number.

221211121210221 is a deficient number, since it is larger than the sum of its proper divisors (87550494108819).

221211121210221 is a wasteful number, since it uses less digits than its factorization.

221211121210221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10308547856.

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 221211121210221 its reverse (122012121112122), we get a palindrome (343223242322343).

The spelling of 221211121210221 in words is "two hundred twenty-one trillion, two hundred eleven billion, one hundred twenty-one million, two hundred ten thousand, two hundred twenty-one".