84365921 has 4 divisors (see below), whose sum is σ = 84388032. Its totient is φ = 84343812.

The previous prime is 84365899. The next prime is 84365923. The reversal of 84365921 is 12956348.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 84365921 - 2⁶ = 84365857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84365923) 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 3 ways as a sum of consecutive naturals, for example, 3701 + ... + 13506.

It is an arithmetic number, because the mean of its divisors is an integer number (21097008).

Almost surely, 2^84365921 is an apocalyptic number.

It is an amenable number.

84365921 is a deficient number, since it is larger than the sum of its proper divisors (22111).

84365921 is a wasteful number, since it uses less digits than its factorization.

84365921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22110.

The product of its digits is 51840, while the sum is 38.

The square root of 84365921 is about 9185.0923239780. The cubic root of 84365921 is about 438.5869285190.

The spelling of 84365921 in words is "eighty-four million, three hundred sixty-five thousand, nine hundred twenty-one".