111672221 has 4 divisors (see below), whose sum is σ = 111693372. Its totient is φ = 111651072.

The previous prime is 111672217. The next prime is 111672227. The reversal of 111672221 is 122276111.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 68244121 + 43428100 = 8261^2 + 6590^2 .

It is a cyclic number.

It is not a de Polignac number, because 111672221 - 2² = 111672217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111672227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4691 + ... + 15663.

It is an arithmetic number, because the mean of its divisors is an integer number (27923343).

Almost surely, 2^111672221 is an apocalyptic number.

It is an amenable number.

111672221 is a deficient number, since it is larger than the sum of its proper divisors (21151).

111672221 is a wasteful number, since it uses less digits than its factorization.

111672221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21150.

The product of its digits is 336, while the sum is 23.

The square root of 111672221 is about 10567.5077951237. The cubic root of 111672221 is about 481.5577588221.

It can be divided in two parts, 1116 and 72221, that added together give a palindrome (73337).

The spelling of 111672221 in words is "one hundred eleven million, six hundred seventy-two thousand, two hundred twenty-one".