84861021 has 16 divisors (see below), whose sum is σ = 132467328. Its totient is φ = 47308800.

The previous prime is 84860959. The next prime is 84861031. The reversal of 84861021 is 12016848.

It is not a de Polignac number, because 84861021 - 2⁹ = 84860509 is a prime.

It is a super-3 number, since 3×84861021³ (a number of 25 digits) contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 84861021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84861031) 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 15 ways as a sum of consecutive naturals, for example, 48420 + ... + 50141.

It is an arithmetic number, because the mean of its divisors is an integer number (8279208).

Almost surely, 2^84861021 is an apocalyptic number.

It is an amenable number.

84861021 is a deficient number, since it is larger than the sum of its proper divisors (47606307).

84861021 is a wasteful number, since it uses less digits than its factorization.

84861021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98612.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 84861021 is about 9212.0041793304. The cubic root of 84861021 is about 439.4432023786.

Adding to 84861021 its reverse (12016848), we get a palindrome (96877869).

The spelling of 84861021 in words is "eighty-four million, eight hundred sixty-one thousand, twenty-one".