16834021 has 2 divisors, whose sum is σ = 16834022. Its totient is φ = 16834020.

The previous prime is 16834009. The next prime is 16834061. The reversal of 16834021 is 12043861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13771521 + 3062500 = 3711^2 + 1750^2 .

It is a cyclic number.

It is not a de Polignac number, because 16834021 - 2¹¹ = 16831973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16834061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8417010 + 8417011.

It is an arithmetic number, because the mean of its divisors is an integer number (8417011).

Almost surely, 2^16834021 is an apocalyptic number.

It is an amenable number.

16834021 is a deficient number, since it is larger than the sum of its proper divisors (1).

16834021 is an equidigital number, since it uses as much as digits as its factorization.

16834021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 16834021 is about 4102.9283444876. The cubic root of 16834021 is about 256.2885996979.

Adding to 16834021 its reverse (12043861), we get a palindrome (28877882).

The spelling of 16834021 in words is "sixteen million, eight hundred thirty-four thousand, twenty-one".