8425220521 has 9 divisors (see below), whose sum is σ = 8893832733. Its totient is φ = 7980135660.

The previous prime is 8425220501. The next prime is 8425220537. The reversal of 8425220521 is 1250225248.

The square root of 8425220521 is 91789.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 8425220521 - 2²¹ = 8423123369 is a prime.

It is a super-2 number, since 2×8425220521² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8425220501) 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 8 ways as a sum of consecutive naturals, for example, 1741576 + ... + 1746406.

It is an arithmetic number, because the mean of its divisors is an integer number (988203637).

Almost surely, 2^8425220521 is an apocalyptic number.

8425220521 is the 91789-th square number.

8425220521 is the 45895-th centered octagonal number.

It is an amenable number.

8425220521 is a deficient number, since it is larger than the sum of its proper divisors (468612212).

8425220521 is an frugal number, since it uses more digits than its factorization.

8425220521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9700 (or 4850 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 31.

The cubic root of 8425220521 is about 2034.8251289828.

Adding to 8425220521 its reverse (1250225248), we get a palindrome (9675445769).

The spelling of 8425220521 in words is "eight billion, four hundred twenty-five million, two hundred twenty thousand, five hundred twenty-one".