8422821 has 24 divisors (see below), whose sum is σ = 13384800. Its totient is φ = 5061600.

The previous prime is 8422811. The next prime is 8422831. The reversal of 8422821 is 1282248.

It is an interprime number because it is at equal distance from previous prime (8422811) and next prime (8422831).

It is not a de Polignac number, because 8422821 - 2¹¹ = 8420773 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8422811) 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, 14466 + ... + 15036.

It is an arithmetic number, because the mean of its divisors is an integer number (557700).

Almost surely, 2^8422821 is an apocalyptic number.

It is an amenable number.

8422821 is a deficient number, since it is larger than the sum of its proper divisors (4961979).

8422821 is a wasteful number, since it uses less digits than its factorization.

8422821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737 (or 734 counting only the distinct ones).

The product of its digits is 2048, while the sum is 27.

The square root of 8422821 is about 2902.2096754025. The cubic root of 8422821 is about 203.4631936444.

It can be divided in two parts, 842 and 2821, that added together give a palindrome (3663).

The spelling of 8422821 in words is "eight million, four hundred twenty-two thousand, eight hundred twenty-one".