421310561 has 4 divisors (see below), whose sum is σ = 481497792. Its totient is φ = 361123332.

The previous prime is 421310537. The next prime is 421310611. The reversal of 421310561 is 165013124.

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 421310561 - 2²² = 417116257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421360561) 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, 30093605 + ... + 30093618.

It is an arithmetic number, because the mean of its divisors is an integer number (120374448).

Almost surely, 2^421310561 is an apocalyptic number.

It is an amenable number.

421310561 is a deficient number, since it is larger than the sum of its proper divisors (60187231).

421310561 is an equidigital number, since it uses as much as digits as its factorization.

421310561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60187230.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 421310561 is about 20525.8510420396. The cubic root of 421310561 is about 749.6653683474.

Adding to 421310561 its reverse (165013124), we get a palindrome (586323685).

The spelling of 421310561 in words is "four hundred twenty-one million, three hundred ten thousand, five hundred sixty-one".