4287338806921 has 9 divisors (see below), whose sum is σ = 4314142481229. Its totient is φ = 4260700679436.

The previous prime is 4287338806889. The next prime is 4287338806963. The reversal of 4287338806921 is 1296088337824.

The square root of 4287338806921 is 2070589.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 4287338806921 - 2⁵ = 4287338806889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4287338806921.

It is not an unprimeable number, because it can be changed into a prime (4287338809921) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 337499656 + ... + 337512358.

It is an arithmetic number, because the mean of its divisors is an integer number (479349164581).

Almost surely, 2^{4287338806921} is an apocalyptic number.

4287338806921 is the 2070589-th square number.

4287338806921 is the 1035295-th centered octagonal number.

It is an amenable number.

4287338806921 is a deficient number, since it is larger than the sum of its proper divisors (26803674308).

4287338806921 is an frugal number, since it uses more digits than its factorization.

4287338806921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25732 (or 12866 counting only the distinct ones).

The product of its (nonzero) digits is 27869184, while the sum is 61.

The spelling of 4287338806921 in words is "four trillion, two hundred eighty-seven billion, three hundred thirty-eight million, eight hundred six thousand, nine hundred twenty-one".