16701021 has 18 divisors (see below), whose sum is σ = 25630202. Its totient is φ = 10477440.

The previous prime is 16701017. The next prime is 16701029. The reversal of 16701021 is 12010761.

It can be written as a sum of positive squares in 3 ways, for example, as 4901796 + 11799225 = 2214^2 + 3435^2 .

It is not a de Polignac number, because 16701021 - 2² = 16701017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16700985 and 16701003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16701029) 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 17 ways as a sum of consecutive naturals, for example, 610 + ... + 5811.

Almost surely, 2^16701021 is an apocalyptic number.

It is an amenable number.

16701021 is a deficient number, since it is larger than the sum of its proper divisors (8929181).

16701021 is a wasteful number, since it uses less digits than its factorization.

16701021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6461 (or 6441 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 18.

The square root of 16701021 is about 4086.6882680234. The cubic root of 16701021 is about 255.6118640117.

Adding to 16701021 its reverse (12010761), we get a palindrome (28711782).

The spelling of 16701021 in words is "sixteen million, seven hundred one thousand, twenty-one".