424144232221 has 4 divisors (see below), whose sum is σ = 424149843744. Its totient is φ = 424138620700.

The previous prime is 424144232207. The next prime is 424144232231. The reversal of 424144232221 is 122232441424.

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 a cyclic number.

It is not a de Polignac number, because 424144232221 - 2³³ = 415554297629 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 (424144232231) 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, 2690815 + ... + 2844076.

It is an arithmetic number, because the mean of its divisors is an integer number (106037460936).

Almost surely, 2^424144232221 is an apocalyptic number.

It is an amenable number.

424144232221 is a deficient number, since it is larger than the sum of its proper divisors (5611523).

424144232221 is an equidigital number, since it uses as much as digits as its factorization.

424144232221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5611522.

The product of its digits is 24576, while the sum is 31.

Adding to 424144232221 its reverse (122232441424), we get a palindrome (546376673645).

The spelling of 424144232221 in words is "four hundred twenty-four billion, one hundred forty-four million, two hundred thirty-two thousand, two hundred twenty-one".