11111100221 has 8 divisors (see below), whose sum is σ = 12012363384. Its totient is φ = 10216488960.

The previous prime is 11111100151. The next prime is 11111100233. The reversal of 11111100221 is 12200111111.

It can be written as a sum of positive squares in 4 ways, for example, as 214036900 + 10897063321 = 14630^2 + 104389^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11111100221 is a prime.

It is a super-2 number, since 2×11111100221² (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 (11111100251) 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, 1659500 + ... + 1666181.

It is an arithmetic number, because the mean of its divisors is an integer number (1501545423).

Almost surely, 2^11111100221 is an apocalyptic number.

It is an amenable number.

11111100221 is a deficient number, since it is larger than the sum of its proper divisors (901263163).

11111100221 is a wasteful number, since it uses less digits than its factorization.

11111100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3325951.

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

Adding to 11111100221 its reverse (12200111111), we get a palindrome (23311211332).

The spelling of 11111100221 in words is "eleven billion, one hundred eleven million, one hundred thousand, two hundred twenty-one".