8424105621 has 4 divisors (see below), whose sum is σ = 11232140832. Its totient is φ = 5616070412.

The previous prime is 8424105589. The next prime is 8424105623. The reversal of 8424105621 is 1265014248.

It is a happy number.

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 8424105621 - 2⁵ = 8424105589 is a prime.

It is a super-4 number, since 4×8424105621⁴ (a number of 41 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8424105623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1404017601 + ... + 1404017606.

It is an arithmetic number, because the mean of its divisors is an integer number (2808035208).

Almost surely, 2^8424105621 is an apocalyptic number.

It is an amenable number.

8424105621 is a deficient number, since it is larger than the sum of its proper divisors (2808035211).

8424105621 is a wasteful number, since it uses less digits than its factorization.

8424105621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2808035210.

The product of its (nonzero) digits is 15360, while the sum is 33.

The square root of 8424105621 is about 91782.9266312641. The cubic root of 8424105621 is about 2034.7353696463.

Adding to 8424105621 its reverse (1265014248), we get a palindrome (9689119869).

The spelling of 8424105621 in words is "eight billion, four hundred twenty-four million, one hundred five thousand, six hundred twenty-one".