84189621 has 4 divisors (see below), whose sum is σ = 112252832. Its totient is φ = 56126412.

The previous prime is 84189613. The next prime is 84189629. The reversal of 84189621 is 12698148.

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 an interprime number because it is at equal distance from previous prime (84189613) and next prime (84189629).

It is not a de Polignac number, because 84189621 - 2³ = 84189613 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 84189621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84189629) 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, 14031601 + ... + 14031606.

It is an arithmetic number, because the mean of its divisors is an integer number (28063208).

Almost surely, 2^84189621 is an apocalyptic number.

It is an amenable number.

84189621 is a deficient number, since it is larger than the sum of its proper divisors (28063211).

84189621 is a wasteful number, since it uses less digits than its factorization.

84189621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28063210.

The product of its digits is 27648, while the sum is 39.

The square root of 84189621 is about 9175.4902321347. The cubic root of 84189621 is about 438.2812095040.

The spelling of 84189621 in words is "eighty-four million, one hundred eighty-nine thousand, six hundred twenty-one".