10111112221 has 6 divisors (see below), whose sum is σ = 11761906110. Its totient is φ = 8666667576.

The previous prime is 10111112203. The next prime is 10111112227. The reversal of 10111112221 is 12221111101.

It is a happy number.

10111112221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 6062335321 + 4048776900 = 77861^2 + 63630^2 .

It is not a de Polignac number, because 10111112221 - 2¹¹ = 10111110173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10111112227) 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 5 ways as a sum of consecutive naturals, for example, 103174566 + ... + 103174663.

It is an arithmetic number, because the mean of its divisors is an integer number (1960317685).

Almost surely, 2^10111112221 is an apocalyptic number.

It is an amenable number.

10111112221 is a deficient number, since it is larger than the sum of its proper divisors (1650793889).

10111112221 is an equidigital number, since it uses as much as digits as its factorization.

10111112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206349243 (or 206349236 counting only the distinct ones).

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

Adding to 10111112221 its reverse (12221111101), we get a palindrome (22332223322).

The spelling of 10111112221 in words is "ten billion, one hundred eleven million, one hundred twelve thousand, two hundred twenty-one".