84204221 has 8 divisors (see below), whose sum is σ = 85001400. Its totient is φ = 83410432.

The previous prime is 84204167. The next prime is 84204229. The reversal of 84204221 is 12240248.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3024121 + 81180100 = 1739^2 + 9010^2 .

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 84204221 - 2⁶ = 84204157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84204229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87881 + ... + 88833.

It is an arithmetic number, because the mean of its divisors is an integer number (10625175).

Almost surely, 2^84204221 is an apocalyptic number.

It is an amenable number.

84204221 is a deficient number, since it is larger than the sum of its proper divisors (797179).

84204221 is a wasteful number, since it uses less digits than its factorization.

84204221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1695.

The product of its (nonzero) digits is 1024, while the sum is 23.

The square root of 84204221 is about 9176.2857954621. The cubic root of 84204221 is about 438.3065433306.

Adding to 84204221 its reverse (12240248), we get a palindrome (96444469).

The spelling of 84204221 in words is "eighty-four million, two hundred four thousand, two hundred twenty-one".