84025021 has 4 divisors (see below), whose sum is σ = 85208544. Its totient is φ = 82841500.

The previous prime is 84025013. The next prime is 84025037. The reversal of 84025021 is 12052048.

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 84025021 - 2³ = 84025013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 84024983 and 84025001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84025061) 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 3 ways as a sum of consecutive naturals, for example, 591655 + ... + 591796.

It is an arithmetic number, because the mean of its divisors is an integer number (21302136).

Almost surely, 2^84025021 is an apocalyptic number.

It is an amenable number.

84025021 is a deficient number, since it is larger than the sum of its proper divisors (1183523).

84025021 is a wasteful number, since it uses less digits than its factorization.

84025021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1183522.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 84025021 is about 9166.5162957363. The cubic root of 84025021 is about 437.9953937785.

Adding to 84025021 its reverse (12052048), we get a palindrome (96077069).

The spelling of 84025021 in words is "eighty-four million, twenty-five thousand, twenty-one".