8553421 has 4 divisors (see below), whose sum is σ = 8681152. Its totient is φ = 8425692.

The previous prime is 8553403. The next prime is 8553437. The reversal of 8553421 is 1243558.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1243558 = 2 ⋅621779.

It is a cyclic number.

It is not a de Polignac number, because 8553421 - 2⁹ = 8552909 is a prime.

It is a super-2 number, since 2×8553421² = 146322021606482, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8553421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8553451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63765 + ... + 63898.

It is an arithmetic number, because the mean of its divisors is an integer number (2170288).

Almost surely, 2^8553421 is an apocalyptic number.

It is an amenable number.

8553421 is a deficient number, since it is larger than the sum of its proper divisors (127731).

8553421 is a wasteful number, since it uses less digits than its factorization.

8553421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127730.

The product of its digits is 4800, while the sum is 28.

The square root of 8553421 is about 2924.6232235965. The cubic root of 8553421 is about 204.5094039032.

Adding to 8553421 its reverse (1243558), we get a palindrome (9796979).

The spelling of 8553421 in words is "eight million, five hundred fifty-three thousand, four hundred twenty-one".