16221412 has 6 divisors (see below), whose sum is σ = 28387478. Its totient is φ = 8110704.

The previous prime is 16221391. The next prime is 16221431. The reversal of 16221412 is 21412261.

It can be written as a sum of positive squares in only one way, i.e., 15492096 + 729316 = 3936^2 + 854^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 16221412.

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 as a sum of consecutive naturals, namely, 2027673 + ... + 2027680.

Almost surely, 2^16221412 is an apocalyptic number.

It is an amenable number.

16221412 is a deficient number, since it is larger than the sum of its proper divisors (12166066).

16221412 is a wasteful number, since it uses less digits than its factorization.

16221412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4055357 (or 4055355 counting only the distinct ones).

The product of its digits is 192, while the sum is 19.

The square root of 16221412 is about 4027.5814082399. The cubic root of 16221412 is about 253.1412294019.

Adding to 16221412 its reverse (21412261), we get a palindrome (37633673).

The spelling of 16221412 in words is "sixteen million, two hundred twenty-one thousand, four hundred twelve".