421444443 has 48 divisors (see below), whose sum is σ = 680076800. Its totient is φ = 232043616.

The previous prime is 421444409. The next prime is 421444447. The reversal of 421444443 is 344444124.

It is not a de Polignac number, because 421444443 - 2¹² = 421440347 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 421444443.

It is not an unprimeable number, because it can be changed into a prime (421444447) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 865146 + ... + 865632.

Almost surely, 2^421444443 is an apocalyptic number.

421444443 is a deficient number, since it is larger than the sum of its proper divisors (258632357).

421444443 is an equidigital number, since it uses as much as digits as its factorization.

421444443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 569 (or 526 counting only the distinct ones).

The product of its digits is 24576, while the sum is 30.

The square root of 421444443 is about 20529.1120850367. The cubic root of 421444443 is about 749.7447682633.

Adding to 421444443 its reverse (344444124), we get a palindrome (765888567).

It can be divided in two parts, 42 and 1444443, that multiplied together give a palindrome (60666606).

The spelling of 421444443 in words is "four hundred twenty-one million, four hundred forty-four thousand, four hundred forty-three".