84841821 has 24 divisors (see below), whose sum is σ = 130278720. Its totient is φ = 53053056.

The previous prime is 84841811. The next prime is 84841829. The reversal of 84841821 is 12814848.

It is a happy number.

It is not a de Polignac number, because 84841821 - 2¹⁰ = 84840797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84841829) 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, 15205 + ... + 20021.

It is an arithmetic number, because the mean of its divisors is an integer number (5428280).

Almost surely, 2^84841821 is an apocalyptic number.

It is an amenable number.

84841821 is a deficient number, since it is larger than the sum of its proper divisors (45436899).

84841821 is a wasteful number, since it uses less digits than its factorization.

84841821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4945 (or 4942 counting only the distinct ones).

The product of its digits is 16384, while the sum is 36.

The square root of 84841821 is about 9210.9620018758. The cubic root of 84841821 is about 439.4100582024.

The spelling of 84841821 in words is "eighty-four million, eight hundred forty-one thousand, eight hundred twenty-one".