4231232521 has 2 divisors, whose sum is σ = 4231232522. Its totient is φ = 4231232520.

The previous prime is 4231232519. The next prime is 4231232543. The reversal of 4231232521 is 1252321324.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3321908496 + 909324025 = 57636^2 + 30155^2 .

It is a cyclic number.

It is not a de Polignac number, because 4231232521 - 2¹ = 4231232519 is a prime.

Together with 4231232519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (4231232591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2115616260 + 2115616261.

It is an arithmetic number, because the mean of its divisors is an integer number (2115616261).

Almost surely, 2^4231232521 is an apocalyptic number.

It is an amenable number.

4231232521 is a deficient number, since it is larger than the sum of its proper divisors (1).

4231232521 is an equidigital number, since it uses as much as digits as its factorization.

4231232521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 25.

The square root of 4231232521 is about 65047.9248016414. The cubic root of 4231232521 is about 1617.4180943327.

Adding to 4231232521 its reverse (1252321324), we get a palindrome (5483553845).

The spelling of 4231232521 in words is "four billion, two hundred thirty-one million, two hundred thirty-two thousand, five hundred twenty-one".