16112221 has 4 divisors (see below), whose sum is σ = 16505244. Its totient is φ = 15719200.

The previous prime is 16112207. The next prime is 16112231. The reversal of 16112221 is 12221161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 784996 + 15327225 = 886^2 + 3915^2 .

It is a cyclic number.

It is not a de Polignac number, because 16112221 - 2⁵ = 16112189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16112195 and 16112204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16112231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 196450 + ... + 196531.

It is an arithmetic number, because the mean of its divisors is an integer number (4126311).

Almost surely, 2^16112221 is an apocalyptic number.

It is an amenable number.

16112221 is a deficient number, since it is larger than the sum of its proper divisors (393023).

16112221 is an equidigital number, since it uses as much as digits as its factorization.

16112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393022.

The product of its digits is 48, while the sum is 16.

The square root of 16112221 is about 4014.0031140994. The cubic root of 16112221 is about 252.5719613213.

Adding to 16112221 its reverse (12221161), we get a palindrome (28333382).

The spelling of 16112221 in words is "sixteen million, one hundred twelve thousand, two hundred twenty-one".