420443221 has 8 divisors (see below), whose sum is σ = 460361088. Its totient is φ = 380808000.

The previous prime is 420443183. The next prime is 420443227. The reversal of 420443221 is 122344024.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 420443221 - 2⁹ = 420442709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 420443192 and 420443201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420443227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67540 + ... + 73501.

It is an arithmetic number, because the mean of its divisors is an integer number (57545136).

Almost surely, 2^420443221 is an apocalyptic number.

It is an amenable number.

420443221 is a deficient number, since it is larger than the sum of its proper divisors (39917867).

420443221 is a wasteful number, since it uses less digits than its factorization.

420443221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141323.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 420443221 is about 20504.7121657438. The cubic root of 420443221 is about 749.1505767070.

Adding to 420443221 its reverse (122344024), we get a palindrome (542787245).

The spelling of 420443221 in words is "four hundred twenty million, four hundred forty-three thousand, two hundred twenty-one".