4400004021 has 32 divisors (see below), whose sum is σ = 7065753600. Its totient is φ = 2379222720.

The previous prime is 4400004019. The next prime is 4400004023. The reversal of 4400004021 is 1204000044.

It is an interprime number because it is at equal distance from previous prime (4400004019) and next prime (4400004023).

It is not a de Polignac number, because 4400004021 - 2¹ = 4400004019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4400004023) 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, 369600 + ... + 381318.

It is an arithmetic number, because the mean of its divisors is an integer number (220804800).

Almost surely, 2^4400004021 is an apocalyptic number.

It is an amenable number.

4400004021 is a deficient number, since it is larger than the sum of its proper divisors (2665749579).

4400004021 is a wasteful number, since it uses less digits than its factorization.

4400004021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12689.

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

The square root of 4400004021 is about 66332.5261165290. The cubic root of 4400004021 is about 1638.6430403664.

Adding to 4400004021 its reverse (1204000044), we get a palindrome (5604004065).

The spelling of 4400004021 in words is "four billion, four hundred million, four thousand, twenty-one".