84030221 has 4 divisors (see below), whose sum is σ = 91669344. Its totient is φ = 76391100.

The previous prime is 84030209. The next prime is 84030223. The reversal of 84030221 is 12203048.

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 84030221 - 2⁶ = 84030157 is a prime.

It is a super-2 number, since 2×84030221² = 14122156082617682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 84030193 and 84030202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84030223) 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, 3819545 + ... + 3819566.

It is an arithmetic number, because the mean of its divisors is an integer number (22917336).

Almost surely, 2^84030221 is an apocalyptic number.

It is an amenable number.

84030221 is a deficient number, since it is larger than the sum of its proper divisors (7639123).

84030221 is a wasteful number, since it uses less digits than its factorization.

84030221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7639122.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 84030221 is about 9166.7999323646. The cubic root of 84030221 is about 438.0044289010.

Adding to 84030221 its reverse (12203048), we get a palindrome (96233269).

The spelling of 84030221 in words is "eighty-four million, thirty thousand, two hundred twenty-one".