10101111221 has 16 divisors (see below), whose sum is σ = 10779931008. Its totient is φ = 9432000000.

The previous prime is 10101111217. The next prime is 10101111253. The reversal of 10101111221 is 12211110101.

10101111221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 10101111221 - 2² = 10101111217 is a prime.

It is a super-2 number, since 2×10101111221² (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 (10101111211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1117721 + ... + 1126721.

It is an arithmetic number, because the mean of its divisors is an integer number (673745688).

Almost surely, 2^10101111221 is an apocalyptic number.

It is an amenable number.

10101111221 is a deficient number, since it is larger than the sum of its proper divisors (678819787).

10101111221 is a wasteful number, since it uses less digits than its factorization.

10101111221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9532.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 10101111221 its reverse (12211110101), we get a palindrome (22312221322).

The spelling of 10101111221 in words is "ten billion, one hundred one million, one hundred eleven thousand, two hundred twenty-one".