1122221111 has 16 divisors (see below), whose sum is σ = 1330252800. Its totient is φ = 935323200.

The previous prime is 1122221077. The next prime is 1122221143. The reversal of 1122221111 is 1111222211.

It is a cyclic number.

It is not a de Polignac number, because 1122221111 - 2⁶ = 1122221047 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 (1122227111) 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, 80126 + ... + 93083.

It is an arithmetic number, because the mean of its divisors is an integer number (83140800).

Almost surely, 2^1122221111 is an apocalyptic number.

1122221111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1122221111 is a deficient number, since it is larger than the sum of its proper divisors (208031689).

1122221111 is a wasteful number, since it uses less digits than its factorization.

1122221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173270.

The product of its digits is 16, while the sum is 14.

The square root of 1122221111 is about 33499.5688181206. The cubic root of 1122221111 is about 1039.1848614568.

Adding to 1122221111 its reverse (1111222211), we get a palindrome (2233443322).

It can be divided in two parts, 11222211 and 11, that multiplied together give a palindrome (123444321).

The spelling of 1122221111 in words is "one billion, one hundred twenty-two million, two hundred twenty-one thousand, one hundred eleven".