84221657 has 12 divisors (see below), whose sum is σ = 93670380. Its totient is φ = 75636288.

The previous prime is 84221647. The next prime is 84221659. The reversal of 84221657 is 75612248.

It can be written as a sum of positive squares in 6 ways, for example, as 755161 + 83466496 = 869^2 + 9136^2 .

It is not a de Polignac number, because 84221657 - 2⁶ = 84221593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84221659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 482 + ... + 12987.

It is an arithmetic number, because the mean of its divisors is an integer number (7805865).

Almost surely, 2^84221657 is an apocalyptic number.

It is an amenable number.

84221657 is a deficient number, since it is larger than the sum of its proper divisors (9448723).

84221657 is a wasteful number, since it uses less digits than its factorization.

84221657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13532 (or 13519 counting only the distinct ones).

The product of its digits is 26880, while the sum is 35.

The square root of 84221657 is about 9177.2358038791. The cubic root of 84221657 is about 438.3367943298.

The spelling of 84221657 in words is "eighty-four million, two hundred twenty-one thousand, six hundred fifty-seven".