111221993 has 4 divisors (see below), whose sum is σ = 111247248. Its totient is φ = 111196740.

The previous prime is 111221977. The next prime is 111222011. The reversal of 111221993 is 399122111.

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: 399122111 = 3361 ⋅118751.

It is a cyclic number.

It is not a de Polignac number, because 111221993 - 2⁴ = 111221977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (111221933) 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, 4103 + ... + 15468.

It is an arithmetic number, because the mean of its divisors is an integer number (27811812).

Almost surely, 2^111221993 is an apocalyptic number.

It is an amenable number.

111221993 is a deficient number, since it is larger than the sum of its proper divisors (25255).

111221993 is an equidigital number, since it uses as much as digits as its factorization.

111221993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25254.

The product of its digits is 972, while the sum is 29.

The square root of 111221993 is about 10546.1838121664. The cubic root of 111221993 is about 480.9097229587.

The spelling of 111221993 in words is "one hundred eleven million, two hundred twenty-one thousand, nine hundred ninety-three".