4016821 has 4 divisors (see below), whose sum is σ = 4023712. Its totient is φ = 4009932.

The previous prime is 4016801. The next prime is 4016827. The reversal of 4016821 is 1286104.

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 4016821 - 2¹³ = 4008629 is a prime.

It is a super-2 number, since 2×4016821² = 32269701892082, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4016792 and 4016801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4016827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2481 + ... + 3766.

It is an arithmetic number, because the mean of its divisors is an integer number (1005928).

Almost surely, 2^4016821 is an apocalyptic number.

It is an amenable number.

4016821 is a deficient number, since it is larger than the sum of its proper divisors (6891).

4016821 is an equidigital number, since it uses as much as digits as its factorization.

4016821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6890.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 4016821 is about 2004.2008382395. The cubic root of 4016821 is about 158.9623079570.

It can be divided in two parts, 40 and 16821, that added together give a palindrome (16861).

The spelling of 4016821 in words is "four million, sixteen thousand, eight hundred twenty-one".