16446021 has 16 divisors (see below), whose sum is σ = 23569344. Its totient is φ = 10162944.

The previous prime is 16446013. The next prime is 16446037. The reversal of 16446021 is 12064461.

It is not a de Polignac number, because 16446021 - 2³ = 16446013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 16445982 and 16446000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16446041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1011 + ... + 5823.

It is an arithmetic number, because the mean of its divisors is an integer number (1473084).

Almost surely, 2^16446021 is an apocalyptic number.

It is an amenable number.

16446021 is a deficient number, since it is larger than the sum of its proper divisors (7123323).

16446021 is a wasteful number, since it uses less digits than its factorization.

16446021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4900.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 16446021 is about 4055.3694036425. The cubic root of 16446021 is about 254.3042471959.

The spelling of 16446021 in words is "sixteen million, four hundred forty-six thousand, twenty-one".