111553221 has 16 divisors (see below), whose sum is σ = 165347840. Its totient is φ = 66432960.

The previous prime is 111553219. The next prime is 111553249. The reversal of 111553221 is 122355111.

It is not a de Polignac number, because 111553221 - 2¹ = 111553219 is a prime.

It is a super-2 number, since 2×111553221² = 24888242230949682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111553121) 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 15 ways as a sum of consecutive naturals, for example, 44926 + ... + 47343.

It is an arithmetic number, because the mean of its divisors is an integer number (10334240).

Almost surely, 2^111553221 is an apocalyptic number.

It is an amenable number.

111553221 is a deficient number, since it is larger than the sum of its proper divisors (53794619).

111553221 is a wasteful number, since it uses less digits than its factorization.

111553221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92316.

The product of its digits is 300, while the sum is 21.

The square root of 111553221 is about 10561.8758277117. The cubic root of 111553221 is about 481.3866457197.

The spelling of 111553221 in words is "one hundred eleven million, five hundred fifty-three thousand, two hundred twenty-one".