4245231521 has 4 divisors (see below), whose sum is σ = 4245404592. Its totient is φ = 4245058452.

The previous prime is 4245231511. The next prime is 4245231569. The reversal of 4245231521 is 1251325424.

4245231521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 4245231521 - 2¹⁴ = 4245215137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4245231511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42155 + ... + 101328.

It is an arithmetic number, because the mean of its divisors is an integer number (1061351148).

Almost surely, 2^4245231521 is an apocalyptic number.

It is an amenable number.

4245231521 is a deficient number, since it is larger than the sum of its proper divisors (173071).

4245231521 is a wasteful number, since it uses less digits than its factorization.

4245231521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173070.

The product of its digits is 9600, while the sum is 29.

The square root of 4245231521 is about 65155.4412232777. The cubic root of 4245231521 is about 1619.1998691885.

Adding to 4245231521 its reverse (1251325424), we get a palindrome (5496556945).

The spelling of 4245231521 in words is "four billion, two hundred forty-five million, two hundred thirty-one thousand, five hundred twenty-one".