4024021021 has 4 divisors (see below), whose sum is σ = 4026791932. Its totient is φ = 4021250112.

The previous prime is 4024021019. The next prime is 4024021033. The reversal of 4024021021 is 1201204204.

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 2987824921 + 1036196100 = 54661^2 + 32190^2 .

It is a cyclic number.

It is not a de Polignac number, because 4024021021 - 2¹ = 4024021019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4024020986 and 4024021004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4024021081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1383276 + ... + 1386181.

It is an arithmetic number, because the mean of its divisors is an integer number (1006697983).

Almost surely, 2^4024021021 is an apocalyptic number.

It is an amenable number.

4024021021 is a deficient number, since it is larger than the sum of its proper divisors (2770911).

4024021021 is a wasteful number, since it uses less digits than its factorization.

4024021021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2770910.

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 4024021021 is about 63435.1717976707. The cubic root of 4024021021 is about 1590.5722952064.

Adding to 4024021021 its reverse (1201204204), we get a palindrome (5225225225).

The spelling of 4024021021 in words is "four billion, twenty-four million, twenty-one thousand, twenty-one".