84007221 has 4 divisors (see below), whose sum is σ = 112009632. Its totient is φ = 56004812.

The previous prime is 84007211. The next prime is 84007223. The reversal of 84007221 is 12270048.

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 84007221 - 2⁷ = 84007093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 84007191 and 84007200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84007223) 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, 14001201 + ... + 14001206.

It is an arithmetic number, because the mean of its divisors is an integer number (28002408).

Almost surely, 2^84007221 is an apocalyptic number.

It is an amenable number.

84007221 is a deficient number, since it is larger than the sum of its proper divisors (28002411).

84007221 is a wasteful number, since it uses less digits than its factorization.

84007221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28002410.

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 84007221 is about 9165.5453192922. The cubic root of 84007221 is about 437.9644630370.

Adding to 84007221 its reverse (12270048), we get a palindrome (96277269).

The spelling of 84007221 in words is "eighty-four million, seven thousand, two hundred twenty-one".