16221956 has 12 divisors (see below), whose sum is σ = 28992768. Its totient is φ = 7938312.

The previous prime is 16221929. The next prime is 16221971. The reversal of 16221956 is 65912261.

It is a happy number.

16221956 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42956 + ... + 43331.

It is an arithmetic number, because the mean of its divisors is an integer number (2416064).

Almost surely, 2^16221956 is an apocalyptic number.

It is an amenable number.

16221956 is a deficient number, since it is larger than the sum of its proper divisors (12770812).

16221956 is a wasteful number, since it uses less digits than its factorization.

16221956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86338 (or 86336 counting only the distinct ones).

The product of its digits is 6480, while the sum is 32.

The square root of 16221956 is about 4027.6489420008. The cubic root of 16221956 is about 253.1440591451.

The spelling of 16221956 in words is "sixteen million, two hundred twenty-one thousand, nine hundred fifty-six".