84004821 has 24 divisors (see below), whose sum is σ = 123161376. Its totient is φ = 55170720.

The previous prime is 84004807. The next prime is 84004829. The reversal of 84004821 is 12840048.

It is not a de Polignac number, because 84004821 - 2⁷ = 84004693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84004829) 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, 253626 + ... + 253956.

It is an arithmetic number, because the mean of its divisors is an integer number (5131724).

Almost surely, 2^84004821 is an apocalyptic number.

It is an amenable number.

84004821 is a deficient number, since it is larger than the sum of its proper divisors (39156555).

84004821 is a wasteful number, since it uses less digits than its factorization.

84004821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673 (or 670 counting only the distinct ones).

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

The square root of 84004821 is about 9165.4143932503. The cubic root of 84004821 is about 437.9602922657.

Adding to 84004821 its reverse (12840048), we get a palindrome (96844869).

The spelling of 84004821 in words is "eighty-four million, four thousand, eight hundred twenty-one".