10111111221 has 8 divisors (see below), whose sum is σ = 13482855424. Its totient is φ = 6740053920.

The previous prime is 10111111189. The next prime is 10111111237. The reversal of 10111111221 is 12211111101.

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

It is not a de Polignac number, because 10111111221 - 2⁵ = 10111111189 is a prime.

It is a super-2 number, since 2×10111111221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

10111111221 is a modest number, since divided by 111221 gives 10111 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 10111111197 and 10111111206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10111110221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136336 + ... + 197001.

It is an arithmetic number, because the mean of its divisors is an integer number (1685356928).

Almost surely, 2^10111111221 is an apocalyptic number.

It is an amenable number.

10111111221 is a deficient number, since it is larger than the sum of its proper divisors (3371744203).

10111111221 is a wasteful number, since it uses less digits than its factorization.

10111111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343451.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 10111111221 its reverse (12211111101), we get a palindrome (22322222322).

The spelling of 10111111221 in words is "ten billion, one hundred eleven million, one hundred eleven thousand, two hundred twenty-one".