10211111221 has 8 divisors (see below), whose sum is σ = 10243869120. Its totient is φ = 10178407008.

The previous prime is 10211111191. The next prime is 10211111227. The reversal of 10211111221 is 12211111201.

It is a happy number.

10211111221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 10211111221 - 2⁵ = 10211111189 is a prime.

It is a super-2 number, since 2×10211111221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10211111227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 386410 + ... + 411988.

It is an arithmetic number, because the mean of its divisors is an integer number (1280483640).

Almost surely, 2^10211111221 is an apocalyptic number.

It is an amenable number.

10211111221 is a deficient number, since it is larger than the sum of its proper divisors (32757899).

10211111221 is an equidigital number, since it uses as much as digits as its factorization.

10211111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26843.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 10211111221 its reverse (12211111201), we get a palindrome (22422222422).

The spelling of 10211111221 in words is "ten billion, two hundred eleven million, one hundred eleven thousand, two hundred twenty-one".