421232545 has 16 divisors (see below), whose sum is σ = 537535440. Its totient is φ = 315787264.

The previous prime is 421232543. The next prime is 421232549. The reversal of 421232545 is 545232124.

It can be written as a sum of positive squares in 8 ways, for example, as 654481 + 420578064 = 809^2 + 20508^2 .

It is a cyclic number.

It is not a de Polignac number, because 421232545 - 2¹ = 421232543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (421232543) 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 in 15 ways as a sum of consecutive naturals, for example, 9171 + ... + 30439.

It is an arithmetic number, because the mean of its divisors is an integer number (33595965).

Almost surely, 2^421232545 is an apocalyptic number.

It is an amenable number.

421232545 is a deficient number, since it is larger than the sum of its proper divisors (116302895).

421232545 is a wasteful number, since it uses less digits than its factorization.

421232545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21524.

The product of its digits is 9600, while the sum is 28.

The square root of 421232545 is about 20523.9505212812. The cubic root of 421232545 is about 749.6190925046.

Adding to 421232545 its reverse (545232124), we get a palindrome (966464669).

The spelling of 421232545 in words is "four hundred twenty-one million, two hundred thirty-two thousand, five hundred forty-five".