4242201521 has 2 divisors, whose sum is σ = 4242201522. Its totient is φ = 4242201520.

The previous prime is 4242201503. The next prime is 4242201527. The reversal of 4242201521 is 1251022424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2684794225 + 1557407296 = 51815^2 + 39464^2 .

It is a cyclic number.

It is not a de Polignac number, because 4242201521 - 2²² = 4238007217 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (4242201527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2121100760 + 2121100761.

It is an arithmetic number, because the mean of its divisors is an integer number (2121100761).

Almost surely, 2^4242201521 is an apocalyptic number.

It is an amenable number.

4242201521 is a deficient number, since it is larger than the sum of its proper divisors (1).

4242201521 is an equidigital number, since it uses as much as digits as its factorization.

4242201521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 4242201521 is about 65132.1849856121. The cubic root of 4242201521 is about 1618.8145471874.

Adding to 4242201521 its reverse (1251022424), we get a palindrome (5493223945).

The spelling of 4242201521 in words is "four billion, two hundred forty-two million, two hundred one thousand, five hundred twenty-one".