420710421 has 4 divisors (see below), whose sum is σ = 560947232. Its totient is φ = 280473612.

The previous prime is 420710419. The next prime is 420710443. The reversal of 420710421 is 124017024.

It is a happy number.

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 not a de Polignac number, because 420710421 - 2¹ = 420710419 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420710491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70118401 + ... + 70118406.

It is an arithmetic number, because the mean of its divisors is an integer number (140236808).

Almost surely, 2^420710421 is an apocalyptic number.

It is an amenable number.

420710421 is a deficient number, since it is larger than the sum of its proper divisors (140236811).

420710421 is a wasteful number, since it uses less digits than its factorization.

420710421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140236810.

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 420710421 is about 20511.2267063674. The cubic root of 420710421 is about 749.3092431130.

Adding to 420710421 its reverse (124017024), we get a palindrome (544727445).

The spelling of 420710421 in words is "four hundred twenty million, seven hundred ten thousand, four hundred twenty-one".