421220643 has 8 divisors (see below), whose sum is σ = 586046208. Its totient is φ = 268604424.

The previous prime is 421220641. The next prime is 421220659. The reversal of 421220643 is 346022124.

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

It is not a de Polignac number, because 421220643 - 2¹ = 421220641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (421220641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3052255 + ... + 3052392.

It is an arithmetic number, because the mean of its divisors is an integer number (73255776).

Almost surely, 2^421220643 is an apocalyptic number.

421220643 is a deficient number, since it is larger than the sum of its proper divisors (164825565).

421220643 is a wasteful number, since it uses less digits than its factorization.

421220643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6104673.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 421220643 is about 20523.6605653085. The cubic root of 421220643 is about 749.6120322315.

Adding to 421220643 its reverse (346022124), we get a palindrome (767242767).

The spelling of 421220643 in words is "four hundred twenty-one million, two hundred twenty thousand, six hundred forty-three".