8424379621 has 8 divisors (see below), whose sum is σ = 9959857920. Its totient is φ = 6971900208.

The previous prime is 8424379609. The next prime is 8424379637. The reversal of 8424379621 is 1269734248.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8424379621 - 2¹¹ = 8424377573 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 (8424379651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20749501 + ... + 20749906.

It is an arithmetic number, because the mean of its divisors is an integer number (1244982240).

Almost surely, 2^8424379621 is an apocalyptic number.

It is an amenable number.

8424379621 is a deficient number, since it is larger than the sum of its proper divisors (1535478299).

8424379621 is a wasteful number, since it uses less digits than its factorization.

8424379621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41499443.

The product of its digits is 580608, while the sum is 46.

The square root of 8424379621 is about 91784.4192714646. The cubic root of 8424379621 is about 2034.7574298100.

The spelling of 8424379621 in words is "eight billion, four hundred twenty-four million, three hundred seventy-nine thousand, six hundred twenty-one".