422420421 has 4 divisors (see below), whose sum is σ = 563227232. Its totient is φ = 281613612.

The previous prime is 422420381. The next prime is 422420429. The reversal of 422420421 is 124024224.

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 422420421 - 2⁶ = 422420357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (422420429) 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 3 ways as a sum of consecutive naturals, for example, 70403401 + ... + 70403406.

It is an arithmetic number, because the mean of its divisors is an integer number (140806808).

Almost surely, 2^422420421 is an apocalyptic number.

It is an amenable number.

422420421 is a deficient number, since it is larger than the sum of its proper divisors (140806811).

422420421 is a wasteful number, since it uses less digits than its factorization.

422420421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140806810.

The product of its (nonzero) digits is 1024, while the sum is 21.

The square root of 422420421 is about 20552.8689238267. The cubic root of 422420421 is about 750.3230732560.

Adding to 422420421 its reverse (124024224), we get a palindrome (546444645).

The spelling of 422420421 in words is "four hundred twenty-two million, four hundred twenty thousand, four hundred twenty-one".