111520221 has 16 divisors (see below), whose sum is σ = 159070464. Its totient is φ = 69249024.

The previous prime is 111520219. The next prime is 111520231. The reversal of 111520221 is 122025111.

It is not a de Polignac number, because 111520221 - 2¹ = 111520219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 111520221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111520231) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6325 + ... + 16218.

It is an arithmetic number, because the mean of its divisors is an integer number (9941904).

Almost surely, 2^111520221 is an apocalyptic number.

It is an amenable number.

111520221 is a deficient number, since it is larger than the sum of its proper divisors (47550243).

111520221 is a wasteful number, since it uses less digits than its factorization.

111520221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22660.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 111520221 is about 10560.3134896650. The cubic root of 111520221 is about 481.3391726365.

Adding to 111520221 its reverse (122025111), we get a palindrome (233545332).

The spelling of 111520221 in words is "one hundred eleven million, five hundred twenty thousand, two hundred twenty-one".