8550021 has 8 divisors (see below), whose sum is σ = 11490304. Its totient is φ = 5654880.

The previous prime is 8550011. The next prime is 8550023. The reversal of 8550021 is 1200558.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8550021 - 2¹⁵ = 8517253 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 8550021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8550023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10840 + ... + 11601.

It is an arithmetic number, because the mean of its divisors is an integer number (1436288).

Almost surely, 2^8550021 is an apocalyptic number.

It is an amenable number.

8550021 is a deficient number, since it is larger than the sum of its proper divisors (2940283).

8550021 is a wasteful number, since it uses less digits than its factorization.

8550021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22571.

The product of its (nonzero) digits is 400, while the sum is 21.

The square root of 8550021 is about 2924.0418943647. The cubic root of 8550021 is about 204.4823026952.

Adding to 8550021 its reverse (1200558), we get a palindrome (9750579).

The spelling of 8550021 in words is "eight million, five hundred fifty thousand, twenty-one".