16706021 has 4 divisors (see below), whose sum is σ = 16740000. Its totient is φ = 16672044.

The previous prime is 16706003. The next prime is 16706047. The reversal of 16706021 is 12060761.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16706021 - 2¹⁴ = 16689637 is a prime.

It is a super-2 number, since 2×16706021² = 558182275304882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16706071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16241 + ... + 17238.

It is an arithmetic number, because the mean of its divisors is an integer number (4185000).

Almost surely, 2^16706021 is an apocalyptic number.

It is an amenable number.

16706021 is a deficient number, since it is larger than the sum of its proper divisors (33979).

16706021 is an equidigital number, since it uses as much as digits as its factorization.

16706021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33978.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 16706021 is about 4087.2999645243. The cubic root of 16706021 is about 255.6373700731.

Adding to 16706021 its reverse (12060761), we get a palindrome (28766782).

The spelling of 16706021 in words is "sixteen million, seven hundred six thousand, twenty-one".