16221286 has 16 divisors (see below), whose sum is σ = 24948000. Its totient is φ = 7907328.

The previous prime is 16221253. The next prime is 16221311. The reversal of 16221286 is 68212261.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 20710 + ... + 21478.

It is an arithmetic number, because the mean of its divisors is an integer number (1559250).

Almost surely, 2^16221286 is an apocalyptic number.

16221286 is a deficient number, since it is larger than the sum of its proper divisors (8726714).

16221286 is a wasteful number, since it uses less digits than its factorization.

16221286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1023.

The product of its digits is 2304, while the sum is 28.

The square root of 16221286 is about 4027.5657660676. The cubic root of 16221286 is about 253.1405739744.

The spelling of 16221286 in words is "sixteen million, two hundred twenty-one thousand, two hundred eighty-six".