16221648 has 40 divisors (see below), whose sum is σ = 42073696. Its totient is φ = 5385600.

The previous prime is 16221641. The next prime is 16221659. The reversal of 16221648 is 84612261.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16221641) 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, 15378 + ... + 16398.

Almost surely, 2^16221648 is an apocalyptic number.

It is an amenable number.

16221648 is an abundant number, since it is smaller than the sum of its proper divisors (25852048).

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

16221648 is a wasteful number, since it uses less digits than its factorization.

16221648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1363 (or 1357 counting only the distinct ones).

The product of its digits is 4608, while the sum is 30.

The square root of 16221648 is about 4027.6107061135. The cubic root of 16221648 is about 253.1424570189.

The spelling of 16221648 in words is "sixteen million, two hundred twenty-one thousand, six hundred forty-eight".