111222001 has 4 divisors (see below), whose sum is σ = 121333104. Its totient is φ = 101110900.

The previous prime is 111221977. The next prime is 111222011. The reversal of 111222001 is 100222111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 100222111 = 11 ⋅9111101.

It is not a de Polignac number, because 111222001 - 2²¹ = 109124849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111222011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5055535 + ... + 5055556.

It is an arithmetic number, because the mean of its divisors is an integer number (30333276).

Almost surely, 2^111222001 is an apocalyptic number.

111222001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111222001 is a deficient number, since it is larger than the sum of its proper divisors (10111103).

111222001 is a wasteful number, since it uses less digits than its factorization.

111222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10111102.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 111222001 is about 10546.1841914505. The cubic root of 111222001 is about 480.9097344891.

Adding to 111222001 its reverse (100222111), we get a palindrome (211444112).

The spelling of 111222001 in words is "one hundred eleven million, two hundred twenty-two thousand, one".