84036921 has 16 divisors (see below), whose sum is σ = 117458880. Its totient is φ = 53383680.

The previous prime is 84036913. The next prime is 84036923. The reversal of 84036921 is 12963048.

It is not a de Polignac number, because 84036921 - 2³ = 84036913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84036923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2656 + ... + 13233.

It is an arithmetic number, because the mean of its divisors is an integer number (7341180).

Almost surely, 2^84036921 is an apocalyptic number.

It is an amenable number.

84036921 is a deficient number, since it is larger than the sum of its proper divisors (33421959).

84036921 is a wasteful number, since it uses less digits than its factorization.

84036921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15976.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 84036921 is about 9167.1653743128. The cubic root of 84036921 is about 438.0160697592.

Adding to 84036921 its reverse (12963048), we get a palindrome (96999969).

The spelling of 84036921 in words is "eighty-four million, thirty-six thousand, nine hundred twenty-one".