4004021021 has 32 divisors (see below), whose sum is σ = 5381435136. Its totient is φ = 2877120000.

The previous prime is 4004020997. The next prime is 4004021023. The reversal of 4004021021 is 1201204004.

4004021021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 4004021021 - 2²² = 3999826717 is a prime.

4004021021 is a modest number, since divided by 21021 gives 4004 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 4004020987 and 4004021005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4004021023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1801691 + ... + 1803911.

It is an arithmetic number, because the mean of its divisors is an integer number (168169848).

Almost surely, 2^4004021021 is an apocalyptic number.

It is an amenable number.

4004021021 is a deficient number, since it is larger than the sum of its proper divisors (1377414115).

4004021021 is a wasteful number, since it uses less digits than its factorization.

4004021021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4053.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 4004021021 is about 63277.3341805737. The cubic root of 4004021021 is about 1587.9327882449.

Adding to 4004021021 its reverse (1201204004), we get a palindrome (5205225025).

The spelling of 4004021021 in words is "four billion, four million, twenty-one thousand, twenty-one".