111225521 has 8 divisors (see below), whose sum is σ = 121414464. Its totient is φ = 101049520.

The previous prime is 111225511. The next prime is 111225523. The reversal of 111225521 is 125522111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-111225521 is a prime.

It is a super-2 number, since 2×111225521² = 24742233043442882, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 111225493 and 111225502.

It is not an unprimeable number, because it can be changed into a prime (111225523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27395 + ... + 31191.

It is an arithmetic number, because the mean of its divisors is an integer number (15176808).

Almost surely, 2^111225521 is an apocalyptic number.

111225521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111225521 is a deficient number, since it is larger than the sum of its proper divisors (10188943).

111225521 is a wasteful number, since it uses less digits than its factorization.

111225521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6471.

The product of its digits is 200, while the sum is 20.

The square root of 111225521 is about 10546.3510751349. The cubic root of 111225521 is about 480.9148077791.

Adding to 111225521 its reverse (125522111), we get a palindrome (236747632).

The spelling of 111225521 in words is "one hundred eleven million, two hundred twenty-five thousand, five hundred twenty-one".