17000021 has 4 divisors (see below), whose sum is σ = 17232972. Its totient is φ = 16767072.

The previous prime is 16999999. The next prime is 17000023. The reversal of 17000021 is 12000071.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12000071 = 503 ⋅23857.

It can be written as a sum of positive squares in 2 ways, for example, as 8059921 + 8940100 = 2839^2 + 2990^2 .

It is a cyclic number.

It is not a de Polignac number, because 17000021 - 2²² = 12805717 is a prime.

It is a Duffinian number.

17000021 is a modest number, since divided by 21 gives 17 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 16999966 and 17000011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17000023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116366 + ... + 116511.

It is an arithmetic number, because the mean of its divisors is an integer number (4308243).

Almost surely, 2^17000021 is an apocalyptic number.

It is an amenable number.

17000021 is a deficient number, since it is larger than the sum of its proper divisors (232951).

17000021 is an equidigital number, since it uses as much as digits as its factorization.

17000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232950.

The product of its (nonzero) digits is 14, while the sum is 11.

The square root of 17000021 is about 4123.1081722409. The cubic root of 17000021 is about 257.1282649421.

Adding to 17000021 its reverse (12000071), we get a palindrome (29000092).

The spelling of 17000021 in words is "seventeen million, twenty-one", and thus it is an aban number and an uban number.