84140221 has 8 divisors (see below), whose sum is σ = 92039904. Its totient is φ = 76282320.

The previous prime is 84140219. The next prime is 84140237. The reversal of 84140221 is 12204148.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 84140221 - 2¹ = 84140219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 84140192 and 84140201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84140291) 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 7 ways as a sum of consecutive naturals, for example, 6151 + ... + 14356.

It is an arithmetic number, because the mean of its divisors is an integer number (11504988).

Almost surely, 2^84140221 is an apocalyptic number.

It is an amenable number.

84140221 is a deficient number, since it is larger than the sum of its proper divisors (7899683).

84140221 is a wasteful number, since it uses less digits than its factorization.

84140221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20891.

The product of its (nonzero) digits is 512, while the sum is 22.

The square root of 84140221 is about 9172.7978828709. The cubic root of 84140221 is about 438.1954692127.

Adding to 84140221 its reverse (12204148), we get a palindrome (96344369).

The spelling of 84140221 in words is "eighty-four million, one hundred forty thousand, two hundred twenty-one".