84143421 has 16 divisors (see below), whose sum is σ = 131990400. Its totient is φ = 52795584.

The previous prime is 84143401. The next prime is 84143443. The reversal of 84143421 is 12434148.

It is not a de Polignac number, because 84143421 - 2¹⁰ = 84142397 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84143401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 91201 + ... + 92118.

It is an arithmetic number, because the mean of its divisors is an integer number (8249400).

Almost surely, 2^84143421 is an apocalyptic number.

It is an amenable number.

84143421 is a deficient number, since it is larger than the sum of its proper divisors (47846979).

84143421 is a wasteful number, since it uses less digits than its factorization.

84143421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183345 (or 183339 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 84143421 is about 9172.9723099985. The cubic root of 84143421 is about 438.2010242561.

Adding to 84143421 its reverse (12434148), we get a palindrome (96577569).

The spelling of 84143421 in words is "eighty-four million, one hundred forty-three thousand, four hundred twenty-one".