16706421 has 6 divisors (see below), whose sum is σ = 24131510. Its totient is φ = 11137608.

The previous prime is 16706419. The next prime is 16706447. The reversal of 16706421 is 12460761.

16706421 is a `hidden beast` number, since 16 + 7 + 0 + 642 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16695396 + 11025 = 4086^2 + 105^2 .

It is not a de Polignac number, because 16706421 - 2¹ = 16706419 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16706401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 928126 + ... + 928143.

Almost surely, 2^16706421 is an apocalyptic number.

It is an amenable number.

16706421 is a deficient number, since it is larger than the sum of its proper divisors (7425089).

16706421 is a wasteful number, since it uses less digits than its factorization.

16706421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856275 (or 1856272 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 16706421 is about 4087.3488962896. The cubic root of 16706421 is about 255.6394103381.

The spelling of 16706421 in words is "sixteen million, seven hundred six thousand, four hundred twenty-one".