8253021 has 24 divisors (see below), whose sum is σ = 13362624. Its totient is φ = 4509120.

The previous prime is 8252989. The next prime is 8253029. The reversal of 8253021 is 1203528.

It is not a de Polignac number, because 8253021 - 2⁵ = 8252989 is a prime.

It is a super-2 number, since 2×8253021² = 136224711252882, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8253029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2161 + ... + 4601.

It is an arithmetic number, because the mean of its divisors is an integer number (556776).

Almost surely, 2^8253021 is an apocalyptic number.

It is an amenable number.

8253021 is a deficient number, since it is larger than the sum of its proper divisors (5109603).

8253021 is a wasteful number, since it uses less digits than its factorization.

8253021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2481 (or 2474 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 8253021 is about 2872.8071637338. The cubic root of 8253021 is about 202.0866618315.

Adding to 8253021 its reverse (1203528), we get a palindrome (9456549).

The spelling of 8253021 in words is "eight million, two hundred fifty-three thousand, twenty-one".