8520421425 has 12 divisors (see below), whose sum is σ = 14087096880. Its totient is φ = 4544224720.

The previous prime is 8520421421. The next prime is 8520421447. The reversal of 8520421425 is 5241240258.

It is not a de Polignac number, because 8520421425 - 2² = 8520421421 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8520421421) 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 11 ways as a sum of consecutive naturals, for example, 56802735 + ... + 56802884.

It is an arithmetic number, because the mean of its divisors is an integer number (1173924740).

Almost surely, 2^8520421425 is an apocalyptic number.

It is an amenable number.

8520421425 is a deficient number, since it is larger than the sum of its proper divisors (5566675455).

8520421425 is a wasteful number, since it uses less digits than its factorization.

8520421425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113605632 (or 113605627 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 33.

The square root of 8520421425 is about 92306.1288593558. The cubic root of 8520421425 is about 2042.4606205644.

The spelling of 8520421425 in words is "eight billion, five hundred twenty million, four hundred twenty-one thousand, four hundred twenty-five".