4021851 has 4 divisors (see below), whose sum is σ = 5362472. Its totient is φ = 2681232.

The previous prime is 4021777. The next prime is 4021867. The reversal of 4021851 is 1581204.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 4021851 - 2¹⁴ = 4005467 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4021891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 670306 + ... + 670311.

It is an arithmetic number, because the mean of its divisors is an integer number (1340618).

Almost surely, 2^4021851 is an apocalyptic number.

4021851 is a deficient number, since it is larger than the sum of its proper divisors (1340621).

4021851 is a wasteful number, since it uses less digits than its factorization.

4021851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1340620.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 4021851 is about 2005.4553098985. The cubic root of 4021851 is about 159.0286329511.

The spelling of 4021851 in words is "four million, twenty-one thousand, eight hundred fifty-one".