11111222221111 has 8 divisors (see below), whose sum is σ = 11119401000000. Its totient is φ = 11103043860480.

The previous prime is 11111222221109. The next prime is 11111222221139. The reversal of 11111222221111 is 11112222211111.

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 11111222221111 - 2¹ = 11111222221109 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11111222221511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70369731 + ... + 70527451.

It is an arithmetic number, because the mean of its divisors is an integer number (1389925125000).

Almost surely, 2^{11111222221111} is an apocalyptic number.

11111222221111 is a deficient number, since it is larger than the sum of its proper divisors (8178778889).

11111222221111 is a wasteful number, since it uses less digits than its factorization.

11111222221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209129.

The product of its digits is 32, while the sum is 19.

Adding to 11111222221111 its reverse (11112222211111), we get a palindrome (22223444432222).

It can be divided in two parts, 11111 and 222221111, that added together give a palindrome (222232222).

The spelling of 11111222221111 in words is "eleven trillion, one hundred eleven billion, two hundred twenty-two million, two hundred twenty-one thousand, one hundred eleven".