4401312021 has 12 divisors (see below), whose sum is σ = 6392577100. Its totient is φ = 2917995840.

The previous prime is 4401312007. The next prime is 4401312037. The reversal of 4401312021 is 1202131044.

It can be written as a sum of positive squares in 2 ways, for example, as 298909521 + 4102402500 = 17289^2 + 64050^2 .

It is not a de Polignac number, because 4401312021 - 2¹⁰ = 4401310997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4401311985 and 4401312003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4401312061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1349296 + ... + 1352553.

Almost surely, 2^4401312021 is an apocalyptic number.

It is an amenable number.

4401312021 is a deficient number, since it is larger than the sum of its proper divisors (1991265079).

4401312021 is a wasteful number, since it uses less digits than its factorization.

4401312021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2702036 (or 2702033 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 4401312021 is about 66342.3848003673. The cubic root of 4401312021 is about 1638.8053987594.

Adding to 4401312021 its reverse (1202131044), we get a palindrome (5603443065).

The spelling of 4401312021 in words is "four billion, four hundred one million, three hundred twelve thousand, twenty-one".