4443431021 has 4 divisors (see below), whose sum is σ = 4486571232. Its totient is φ = 4400290812.

The previous prime is 4443431017. The next prime is 4443431033. The reversal of 4443431021 is 1201343444.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4443431021 - 2² = 4443431017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4443431071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21569951 + ... + 21570156.

It is an arithmetic number, because the mean of its divisors is an integer number (1121642808).

Almost surely, 2^4443431021 is an apocalyptic number.

It is an amenable number.

4443431021 is a deficient number, since it is larger than the sum of its proper divisors (43140211).

4443431021 is a wasteful number, since it uses less digits than its factorization.

4443431021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43140210.

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 4443431021 is about 66659.0655575069. The cubic root of 4443431021 is about 1644.0164075308.

Adding to 4443431021 its reverse (1201343444), we get a palindrome (5644774465).

The spelling of 4443431021 in words is "four billion, four hundred forty-three million, four hundred thirty-one thousand, twenty-one".