8250021 has 24 divisors (see below), whose sum is σ = 12972960. Its totient is φ = 5021856.

The previous prime is 8250019. The next prime is 8250037. The reversal of 8250021 is 1200528.

It is not a de Polignac number, because 8250021 - 2¹ = 8250019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8249976 and 8250003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8250071) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12190 + ... + 12848.

It is an arithmetic number, because the mean of its divisors is an integer number (540540).

Almost surely, 2^8250021 is an apocalyptic number.

It is an amenable number.

8250021 is a deficient number, since it is larger than the sum of its proper divisors (4722939).

8250021 is a wasteful number, since it uses less digits than its factorization.

8250021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 785 (or 782 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 8250021 is about 2872.2849788975. The cubic root of 8250021 is about 202.0621724775.

Adding to 8250021 its reverse (1200528), we get a palindrome (9450549).

The spelling of 8250021 in words is "eight million, two hundred fifty thousand, twenty-one".