4207857421 has 2 divisors, whose sum is σ = 4207857422. Its totient is φ = 4207857420.

The previous prime is 4207857413. The next prime is 4207857427. The reversal of 4207857421 is 1247587024.

4207857421 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3050905225 + 1156952196 = 55235^2 + 34014^2 .

It is a cyclic number.

It is not a de Polignac number, because 4207857421 - 2³ = 4207857413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4207857427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2103928710 + 2103928711.

It is an arithmetic number, because the mean of its divisors is an integer number (2103928711).

Almost surely, 2^4207857421 is an apocalyptic number.

It is an amenable number.

4207857421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4207857421 is an equidigital number, since it uses as much as digits as its factorization.

4207857421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 125440, while the sum is 40.

The square root of 4207857421 is about 64867.9999768761. Note that the first 4 decimals coincide. The cubic root of 4207857421 is about 1614.4341611556.

It can be divided in two parts, 42078 and 57421, that added together give a palindrome (99499).

The spelling of 4207857421 in words is "four billion, two hundred seven million, eight hundred fifty-seven thousand, four hundred twenty-one".