424334231221 has 4 divisors (see below), whose sum is σ = 425782471212. Its totient is φ = 422885991232.

The previous prime is 424334231219. The next prime is 424334231249. The reversal of 424334231221 is 122132433424.

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 304136808196 + 120197423025 = 551486^2 + 346695^2 .

It is a cyclic number.

It is not a de Polignac number, because 424334231221 - 2¹ = 424334231219 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 (424334231921) 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, 724119556 + ... + 724120141.

It is an arithmetic number, because the mean of its divisors is an integer number (106445617803).

Almost surely, 2^424334231221 is an apocalyptic number.

It is an amenable number.

424334231221 is a deficient number, since it is larger than the sum of its proper divisors (1448239991).

424334231221 is a wasteful number, since it uses less digits than its factorization.

424334231221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1448239990.

The product of its digits is 27648, while the sum is 31.

Adding to 424334231221 its reverse (122132433424), we get a palindrome (546466664645).

The spelling of 424334231221 in words is "four hundred twenty-four billion, three hundred thirty-four million, two hundred thirty-one thousand, two hundred twenty-one".