84288021 has 4 divisors (see below), whose sum is σ = 112384032. Its totient is φ = 56192012.

The previous prime is 84288019. The next prime is 84288067. The reversal of 84288021 is 12088248.

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 84288021 - 2¹ = 84288019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84288821) 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, 14048001 + ... + 14048006.

It is an arithmetic number, because the mean of its divisors is an integer number (28096008).

Almost surely, 2^84288021 is an apocalyptic number.

It is an amenable number.

84288021 is a deficient number, since it is larger than the sum of its proper divisors (28096011).

84288021 is a wasteful number, since it uses less digits than its factorization.

84288021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28096010.

The product of its (nonzero) digits is 8192, while the sum is 33.

The square root of 84288021 is about 9180.8507775696. The cubic root of 84288021 is about 438.4518959430.

The spelling of 84288021 in words is "eighty-four million, two hundred eighty-eight thousand, twenty-one".