84065021 has 4 divisors (see below), whose sum is σ = 84505344. Its totient is φ = 83624700.

The previous prime is 84064993. The next prime is 84065041. The reversal of 84065021 is 12056048.

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 84065021 - 2¹⁴ = 84048637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84065041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219875 + ... + 220256.

It is an arithmetic number, because the mean of its divisors is an integer number (21126336).

Almost surely, 2^84065021 is an apocalyptic number.

It is an amenable number.

84065021 is a deficient number, since it is larger than the sum of its proper divisors (440323).

84065021 is a wasteful number, since it uses less digits than its factorization.

84065021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440322.

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 84065021 is about 9168.6978901041. The cubic root of 84065021 is about 438.0648851283.

The spelling of 84065021 in words is "eighty-four million, sixty-five thousand, twenty-one".