4000404021 has 16 divisors (see below), whose sum is σ = 5511659520. Its totient is φ = 2578221360.

The previous prime is 4000404019. The next prime is 4000404059. The reversal of 4000404021 is 1204040004.

It is not a de Polignac number, because 4000404021 - 2¹ = 4000404019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4000504021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69540 + ... + 113298.

It is an arithmetic number, because the mean of its divisors is an integer number (344478720).

Almost surely, 2^4000404021 is an apocalyptic number.

It is an amenable number.

4000404021 is a deficient number, since it is larger than the sum of its proper divisors (1511255499).

4000404021 is a wasteful number, since it uses less digits than its factorization.

4000404021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44776.

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

The square root of 4000404021 is about 63248.7471891736. The cubic root of 4000404021 is about 1587.4544954489.

Adding to 4000404021 its reverse (1204040004), we get a palindrome (5204444025).

The spelling of 4000404021 in words is "four billion, four hundred four thousand, twenty-one".