84689221 has 2 divisors, whose sum is σ = 84689222. Its totient is φ = 84689220.

The previous prime is 84689203. The next prime is 84689237. The reversal of 84689221 is 12298648.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 83448225 + 1240996 = 9135^2 + 1114^2 .

It is a cyclic number.

It is not a de Polignac number, because 84689221 - 2²³ = 76300613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84689021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42344610 + 42344611.

It is an arithmetic number, because the mean of its divisors is an integer number (42344611).

Almost surely, 2^84689221 is an apocalyptic number.

It is an amenable number.

84689221 is a deficient number, since it is larger than the sum of its proper divisors (1).

84689221 is an equidigital number, since it uses as much as digits as its factorization.

84689221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 40.

The square root of 84689221 is about 9202.6746655524. The cubic root of 84689221 is about 439.1464530750.

It can be divided in two parts, 8468 and 9221, that added together give a square (17689 = 133²).

The spelling of 84689221 in words is "eighty-four million, six hundred eighty-nine thousand, two hundred twenty-one".