16221706 has 16 divisors (see below), whose sum is σ = 27120960. Its totient is φ = 7231680.

The previous prime is 16221703. The next prime is 16221713. The reversal of 16221706 is 60712261.

16221706 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (16221703) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11910 + ... + 13201.

It is an arithmetic number, because the mean of its divisors is an integer number (1695060).

Almost surely, 2^16221706 is an apocalyptic number.

16221706 is a deficient number, since it is larger than the sum of its proper divisors (10899254).

16221706 is a wasteful number, since it uses less digits than its factorization.

16221706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25149.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 16221706 is about 4027.6179064057. The cubic root of 16221706 is about 253.1427587195.

Adding to 16221706 its reverse (60712261), we get a palindrome (76933967).

The spelling of 16221706 in words is "sixteen million, two hundred twenty-one thousand, seven hundred six".