111721225 has 36 divisors (see below), whose sum is σ = 175823568. Its totient is φ = 69636000.

The previous prime is 111721217. The next prime is 111721231. The reversal of 111721225 is 522127111.

It is not a de Polignac number, because 111721225 - 2³ = 111721217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111721196 and 111721205.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 9330 + ... + 17620.

It is an arithmetic number, because the mean of its divisors is an integer number (4883988).

Almost surely, 2^111721225 is an apocalyptic number.

It is an amenable number.

111721225 is a deficient number, since it is larger than the sum of its proper divisors (64102343).

111721225 is a wasteful number, since it uses less digits than its factorization.

111721225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8326 (or 8314 counting only the distinct ones).

The product of its digits is 280, while the sum is 22.

The square root of 111721225 is about 10569.8261575108. The cubic root of 111721225 is about 481.6281875741.

Adding to 111721225 its reverse (522127111), we get a palindrome (633848336).

The spelling of 111721225 in words is "one hundred eleven million, seven hundred twenty-one thousand, two hundred twenty-five".