84425221 has 2 divisors, whose sum is σ = 84425222. Its totient is φ = 84425220.

The previous prime is 84425141. The next prime is 84425239. The reversal of 84425221 is 12252448.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72488196 + 11937025 = 8514^2 + 3455^2 .

It is a cyclic number.

It is not a de Polignac number, because 84425221 - 2²⁵ = 50870789 is a prime.

It is equal to p_4912291 and since 84425221 and 4912291 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 84425221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84425261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42212610 + 42212611.

It is an arithmetic number, because the mean of its divisors is an integer number (42212611).

Almost surely, 2^84425221 is an apocalyptic number.

It is an amenable number.

84425221 is a deficient number, since it is larger than the sum of its proper divisors (1).

84425221 is an equidigital number, since it uses as much as digits as its factorization.

84425221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5120, while the sum is 28.

The square root of 84425221 is about 9188.3198137636. The cubic root of 84425221 is about 438.6896639731.

Adding to 84425221 its reverse (12252448), we get a palindrome (96677669).

The spelling of 84425221 in words is "eighty-four million, four hundred twenty-five thousand, two hundred twenty-one".