4431347021 has 4 divisors (see below), whose sum is σ = 4447820700. Its totient is φ = 4414873344.

The previous prime is 4431347017. The next prime is 4431347027. The reversal of 4431347021 is 1207431344.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 460960900 + 3970386121 = 21470^2 + 63011^2 .

It is a cyclic number.

It is not a de Polignac number, because 4431347021 - 2² = 4431347017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4431347027) 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, 8236436 + ... + 8236973.

It is an arithmetic number, because the mean of its divisors is an integer number (1111955175).

Almost surely, 2^4431347021 is an apocalyptic number.

It is an amenable number.

4431347021 is a deficient number, since it is larger than the sum of its proper divisors (16473679).

4431347021 is a wasteful number, since it uses less digits than its factorization.

4431347021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16473678.

The product of its (nonzero) digits is 8064, while the sum is 29.

The square root of 4431347021 is about 66568.3635145104. The cubic root of 4431347021 is about 1642.5247426168.

Adding to 4431347021 its reverse (1207431344), we get a palindrome (5638778365).

The spelling of 4431347021 in words is "four billion, four hundred thirty-one million, three hundred forty-seven thousand, twenty-one".