8521340447 has 4 divisors (see below), whose sum is σ = 8559552960. Its totient is φ = 8483127936.

The previous prime is 8521340431. The next prime is 8521340459. The reversal of 8521340447 is 7440431258.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8521340447 - 2⁴ = 8521340431 is a prime.

It is a super-2 number, since 2×8521340447² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8521340447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8521340417) 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, 19105922 + ... + 19106367.

It is an arithmetic number, because the mean of its divisors is an integer number (2139888240).

Almost surely, 2^8521340447 is an apocalyptic number.

8521340447 is a deficient number, since it is larger than the sum of its proper divisors (38212513).

8521340447 is a wasteful number, since it uses less digits than its factorization.

8521340447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38212512.

The product of its (nonzero) digits is 107520, while the sum is 38.

The square root of 8521340447 is about 92311.1068452762. The cubic root of 8521340447 is about 2042.5340519385.

The spelling of 8521340447 in words is "eight billion, five hundred twenty-one million, three hundred forty thousand, four hundred forty-seven".