111442221 has 12 divisors (see below), whose sum is σ = 175606080. Its totient is φ = 67540680.

The previous prime is 111442171. The next prime is 111442229. The reversal of 111442221 is 122244111.

111442221 is a `hidden beast` number, since 1 + 1 + 1 + 442 + 221 = 666.

It is not a de Polignac number, because 111442221 - 2¹⁵ = 111409453 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 111442194 and 111442203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111442229) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 562741 + ... + 562938.

It is an arithmetic number, because the mean of its divisors is an integer number (14633840).

Almost surely, 2^111442221 is an apocalyptic number.

111442221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111442221 is a deficient number, since it is larger than the sum of its proper divisors (64163859).

111442221 is a wasteful number, since it uses less digits than its factorization.

111442221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125696 (or 1125693 counting only the distinct ones).

The product of its digits is 128, while the sum is 18.

The square root of 111442221 is about 10556.6197714988. The cubic root of 111442221 is about 481.2269262902.

Adding to 111442221 its reverse (122244111), we get a palindrome (233686332).

The spelling of 111442221 in words is "one hundred eleven million, four hundred forty-two thousand, two hundred twenty-one".