421544441 has 4 divisors (see below), whose sum is σ = 432937572. Its totient is φ = 410151312.

The previous prime is 421544419. The next prime is 421544477. The reversal of 421544441 is 144445124.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 344473600 + 77070841 = 18560^2 + 8779^2 .

It is a cyclic number.

It is not a de Polignac number, because 421544441 - 2¹⁰ = 421543417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421544401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5696510 + ... + 5696583.

It is an arithmetic number, because the mean of its divisors is an integer number (108234393).

Almost surely, 2^421544441 is an apocalyptic number.

It is an amenable number.

421544441 is a deficient number, since it is larger than the sum of its proper divisors (11393131).

421544441 is a wasteful number, since it uses less digits than its factorization.

421544441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11393130.

The product of its digits is 10240, while the sum is 29.

The square root of 421544441 is about 20531.5474575104. The cubic root of 421544441 is about 749.8040620007.

Adding to 421544441 its reverse (144445124), we get a palindrome (565989565).

The spelling of 421544441 in words is "four hundred twenty-one million, five hundred forty-four thousand, four hundred forty-one".