84337821 has 8 divisors (see below), whose sum is σ = 124944960. Its totient is φ = 56225196.

The previous prime is 84337817. The next prime is 84337831. The reversal of 84337821 is 12873348.

It is not a de Polignac number, because 84337821 - 2² = 84337817 is a prime.

It is a super-2 number, since 2×84337821² = 14225736102056082, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84337801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1561785 + ... + 1561838.

It is an arithmetic number, because the mean of its divisors is an integer number (15618120).

Almost surely, 2^84337821 is an apocalyptic number.

It is an amenable number.

84337821 is a deficient number, since it is larger than the sum of its proper divisors (40607139).

84337821 is a wasteful number, since it uses less digits than its factorization.

84337821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3123632 (or 3123626 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 84337821 is about 9183.5625440240. The cubic root of 84337821 is about 438.5382293085.

It can be divided in two parts, 84337 and 821, that added together give a palindrome (85158).

The spelling of 84337821 in words is "eighty-four million, three hundred thirty-seven thousand, eight hundred twenty-one".