221231012211 has 32 divisors (see below), whose sum is σ = 365152435200. Its totient is φ = 131226639840.

The previous prime is 221231012183. The next prime is 221231012213. The reversal of 221231012211 is 112210132122.

221231012211 is a `hidden beast` number, since 221 + 2 + 310 + 122 + 11 = 666.

221231012211 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 221231012211 - 2⁶ = 221231012147 is a prime.

It is a super-2 number, since 2×221231012211² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221231012213) 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 31 ways as a sum of consecutive naturals, for example, 7910356 + ... + 7938273.

It is an arithmetic number, because the mean of its divisors is an integer number (11411013600).

Almost surely, 2^221231012211 is an apocalyptic number.

221231012211 is a deficient number, since it is larger than the sum of its proper divisors (143921422989).

221231012211 is a wasteful number, since it uses less digits than its factorization.

221231012211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15848696 (or 15848690 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 221231012211 its reverse (112210132122), we get a palindrome (333441144333).

The spelling of 221231012211 in words is "two hundred twenty-one billion, two hundred thirty-one million, twelve thousand, two hundred eleven".