421520565 has 8 divisors (see below), whose sum is σ = 674432928. Its totient is φ = 224810960.

The previous prime is 421520557. The next prime is 421520569. The reversal of 421520565 is 565025124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 421520565 - 2³ = 421520557 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421520569) 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 7 ways as a sum of consecutive naturals, for example, 14050671 + ... + 14050700.

It is an arithmetic number, because the mean of its divisors is an integer number (84304116).

Almost surely, 2^421520565 is an apocalyptic number.

It is an amenable number.

421520565 is a deficient number, since it is larger than the sum of its proper divisors (252912363).

421520565 is a wasteful number, since it uses less digits than its factorization.

421520565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28101379.

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 421520565 is about 20530.9660026020. The cubic root of 421520565 is about 749.7899055971.

Adding to 421520565 its reverse (565025124), we get a palindrome (986545689).

The spelling of 421520565 in words is "four hundred twenty-one million, five hundred twenty thousand, five hundred sixty-five".