4024020021 has 16 divisors (see below), whose sum is σ = 6133360128. Its totient is φ = 2298870000.

The previous prime is 4024019921. The next prime is 4024020029. The reversal of 4024020021 is 1200204204.

It is not a de Polignac number, because 4024020021 - 2¹¹ = 4024017973 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4024020029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71946 + ... + 114996.

It is an arithmetic number, because the mean of its divisors is an integer number (383335008).

Almost surely, 2^4024020021 is an apocalyptic number.

It is an amenable number.

4024020021 is a deficient number, since it is larger than the sum of its proper divisors (2109340107).

4024020021 is a wasteful number, since it uses less digits than its factorization.

4024020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47512.

The product of its (nonzero) digits is 128, while the sum is 15.

The square root of 4024020021 is about 63435.1639156076. The cubic root of 4024020021 is about 1590.5721634499.

Adding to 4024020021 its reverse (1200204204), we get a palindrome (5224224225).

The spelling of 4024020021 in words is "four billion, twenty-four million, twenty thousand, twenty-one".