16221964 has 24 divisors (see below), whose sum is σ = 31223808. Its totient is φ = 7313040.

The previous prime is 16221929. The next prime is 16221971. The reversal of 16221964 is 46912261.

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, 4137 + ... + 7039.

It is an arithmetic number, because the mean of its divisors is an integer number (1300992).

Almost surely, 2^16221964 is an apocalyptic number.

It is an amenable number.

16221964 is a deficient number, since it is larger than the sum of its proper divisors (15001844).

16221964 is a wasteful number, since it uses less digits than its factorization.

16221964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3045 (or 3043 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 16221964 is about 4027.6499351359. The cubic root of 16221964 is about 253.1441007585.

The spelling of 16221964 in words is "sixteen million, two hundred twenty-one thousand, nine hundred sixty-four".