16221016 has 32 divisors (see below), whose sum is σ = 35504640. Its totient is φ = 6802848.

The previous prime is 16220977. The next prime is 16221017. The reversal of 16221016 is 61012261.

It is a junction number, because it is equal to n+sod(n) for n = 16220984 and 16221002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16221017) 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 7 ways as a sum of consecutive naturals, for example, 450 + ... + 5713.

It is an arithmetic number, because the mean of its divisors is an integer number (1109520).

Almost surely, 2^16221016 is an apocalyptic number.

It is an amenable number.

16221016 is an abundant number, since it is smaller than the sum of its proper divisors (19283624).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16221016 is a wasteful number, since it uses less digits than its factorization.

16221016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6223 (or 6219 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 16221016 is about 4027.5322469224. The cubic root of 16221016 is about 253.1391694756.

Adding to 16221016 its reverse (61012261), we get a palindrome (77233277).

The spelling of 16221016 in words is "sixteen million, two hundred twenty-one thousand, sixteen".