4401405021 has 16 divisors (see below), whose sum is σ = 6390982080. Its totient is φ = 2678121600.

The previous prime is 4401404999. The next prime is 4401405059. The reversal of 4401405021 is 1205041044.

It is a happy number.

It is not a de Polignac number, because 4401405021 - 2¹³ = 4401396829 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4401405521) 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, 630555 + ... + 637496.

It is an arithmetic number, because the mean of its divisors is an integer number (399436380).

Almost surely, 2^4401405021 is an apocalyptic number.

It is an amenable number.

4401405021 is a deficient number, since it is larger than the sum of its proper divisors (1989577059).

4401405021 is a wasteful number, since it uses less digits than its factorization.

4401405021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1268156.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 4401405021 is about 66343.0857060478. The cubic root of 4401405021 is about 1638.8169413652.

Adding to 4401405021 its reverse (1205041044), we get a palindrome (5606446065).

The spelling of 4401405021 in words is "four billion, four hundred one million, four hundred five thousand, twenty-one".