4072021 has 4 divisors (see below), whose sum is σ = 4099500. Its totient is φ = 4044544.

The previous prime is 4072009. The next prime is 4072039. The reversal of 4072021 is 1202704.

4072021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1134225 + 2937796 = 1065^2 + 1714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4072021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4071986 and 4072004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4072091) 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, 13516 + ... + 13813.

It is an arithmetic number, because the mean of its divisors is an integer number (1024875).

Almost surely, 2^4072021 is an apocalyptic number.

It is an amenable number.

4072021 is a deficient number, since it is larger than the sum of its proper divisors (27479).

4072021 is a wasteful number, since it uses less digits than its factorization.

4072021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27478.

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 4072021 is about 2017.9249242725. The cubic root of 4072021 is about 159.6871621642.

Adding to 4072021 its reverse (1202704), we get a palindrome (5274725).

The spelling of 4072021 in words is "four million, seventy-two thousand, twenty-one".