4243210013521 has 2 divisors, whose sum is σ = 4243210013522. Its totient is φ = 4243210013520.

The previous prime is 4243210013491. The next prime is 4243210013531. The reversal of 4243210013521 is 1253100123424.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4036402446400 + 206807567121 = 2009080^2 + 454761^2 .

It is a cyclic number.

It is not a de Polignac number, because 4243210013521 - 2⁵ = 4243210013489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4243210013521.

It is not a weakly prime, because it can be changed into another prime (4243210013531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2121605006760 + 2121605006761.

It is an arithmetic number, because the mean of its divisors is an integer number (2121605006761).

Almost surely, 2^{4243210013521} is an apocalyptic number.

It is an amenable number.

4243210013521 is a deficient number, since it is larger than the sum of its proper divisors (1).

4243210013521 is an equidigital number, since it uses as much as digits as its factorization.

4243210013521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 28.

Adding to 4243210013521 its reverse (1253100123424), we get a palindrome (5496310136945).

The spelling of 4243210013521 in words is "four trillion, two hundred forty-three billion, two hundred ten million, thirteen thousand, five hundred twenty-one".