211003231221 has 24 divisors (see below), whose sum is σ = 313400555520. Its totient is φ = 136700480736.

The previous prime is 211003231217. The next prime is 211003231273. The reversal of 211003231221 is 122132300112.

211003231221 is a `hidden beast` number, since 21 + 100 + 323 + 1 + 221 = 666.

211003231221 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 211003231221 - 2² = 211003231217 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 211003231194 and 211003231203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211003236221) 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 23 ways as a sum of consecutive naturals, for example, 110901 + ... + 659018.

It is an arithmetic number, because the mean of its divisors is an integer number (13058356480).

Almost surely, 2^211003231221 is an apocalyptic number.

It is an amenable number.

211003231221 is a deficient number, since it is larger than the sum of its proper divisors (102397324299).

211003231221 is a wasteful number, since it uses less digits than its factorization.

211003231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 770785 (or 770782 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 211003231221 its reverse (122132300112), we get a palindrome (333135531333).

The spelling of 211003231221 in words is "two hundred eleven billion, three million, two hundred thirty-one thousand, two hundred twenty-one".