4307216521 has 2 divisors, whose sum is σ = 4307216522. Its totient is φ = 4307216520.

The previous prime is 4307216513. The next prime is 4307216531. The reversal of 4307216521 is 1256127034.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3466854400 + 840362121 = 58880^2 + 28989^2 .

It is a cyclic number.

It is not a de Polignac number, because 4307216521 - 2³ = 4307216513 is a prime.

It is a super-2 number, since 2×4307216521² = 37104228317550686882, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (4307216531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2153608260 + 2153608261.

It is an arithmetic number, because the mean of its divisors is an integer number (2153608261).

Almost surely, 2^4307216521 is an apocalyptic number.

It is an amenable number.

4307216521 is a deficient number, since it is larger than the sum of its proper divisors (1).

4307216521 is an equidigital number, since it uses as much as digits as its factorization.

4307216521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 4307216521 is about 65629.3876323709. The cubic root of 4307216521 is about 1627.0425151397.

The spelling of 4307216521 in words is "four billion, three hundred seven million, two hundred sixteen thousand, five hundred twenty-one".