4021520317 has 2 divisors, whose sum is σ = 4021520318. Its totient is φ = 4021520316.

The previous prime is 4021520311. The next prime is 4021520351. The reversal of 4021520317 is 7130251204.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3641036281 + 380484036 = 60341^2 + 19506^2 .

It is a cyclic number.

It is not a de Polignac number, because 4021520317 - 2²⁷ = 3887302589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4021520291 and 4021520300.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4021520311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2010760158 + 2010760159.

It is an arithmetic number, because the mean of its divisors is an integer number (2010760159).

Almost surely, 2^4021520317 is an apocalyptic number.

It is an amenable number.

4021520317 is a deficient number, since it is larger than the sum of its proper divisors (1).

4021520317 is an equidigital number, since it uses as much as digits as its factorization.

4021520317 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 4021520317 is about 63415.4580287803. The cubic root of 4021520317 is about 1590.2427430241.

The spelling of 4021520317 in words is "four billion, twenty-one million, five hundred twenty thousand, three hundred seventeen".