8224257921 has 8 divisors (see below), whose sum is σ = 11962557024. Its totient is φ = 4984398720.

The previous prime is 8224257911. The next prime is 8224257947. The reversal of 8224257921 is 1297524228.

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

It is not a de Polignac number, because 8224257921 - 2⁵ = 8224257889 is a prime.

It is a super-3 number, since 3×8224257921³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8224257911) 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, 124609936 + ... + 124610001.

It is an arithmetic number, because the mean of its divisors is an integer number (1495319628).

Almost surely, 2^8224257921 is an apocalyptic number.

It is an amenable number.

8224257921 is a deficient number, since it is larger than the sum of its proper divisors (3738299103).

8224257921 is a wasteful number, since it uses less digits than its factorization.

8224257921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249219951.

The product of its digits is 161280, while the sum is 42.

The square root of 8224257921 is about 90687.6944298398. The cubic root of 8224257921 is about 2018.5162061156.

The spelling of 8224257921 in words is "eight billion, two hundred twenty-four million, two hundred fifty-seven thousand, nine hundred twenty-one".