4020021005 has 48 divisors (see below), whose sum is σ = 6592731264. Its totient is φ = 2313198720.

The previous prime is 4020021001. The next prime is 4020021053. The reversal of 4020021005 is 5001200204.

It is not a de Polignac number, because 4020021005 - 2² = 4020021001 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 (4020021001) 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 47 ways as a sum of consecutive naturals, for example, 22337 + ... + 92406.

It is an arithmetic number, because the mean of its divisors is an integer number (137348568).

Almost surely, 2^4020021005 is an apocalyptic number.

It is an amenable number.

4020021005 is a deficient number, since it is larger than the sum of its proper divisors (2572710259).

4020021005 is a wasteful number, since it uses less digits than its factorization.

4020021005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114786 (or 114779 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 4020021005 is about 63403.6355818813. The cubic root of 4020021005 is about 1590.0450925334.

Adding to 4020021005 its reverse (5001200204), we get a palindrome (9021221209).

The spelling of 4020021005 in words is "four billion, twenty million, twenty-one thousand, five".