84408588894221 has 2 divisors, whose sum is σ = 84408588894222. Its totient is φ = 84408588894220.

The previous prime is 84408588894211. The next prime is 84408588894233. The reversal of 84408588894221 is 12249888580448.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56773738477225 + 27634850416996 = 7534835^2 + 5256886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84408588894221 is a prime.

It is a super-2 number, since 2×84408588894221² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84408588894211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42204294447110 + 42204294447111.

It is an arithmetic number, because the mean of its divisors is an integer number (42204294447111).

Almost surely, 2^{84408588894221} is an apocalyptic number.

It is an amenable number.

84408588894221 is a deficient number, since it is larger than the sum of its proper divisors (1).

84408588894221 is an equidigital number, since it uses as much as digits as its factorization.

84408588894221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 377487360, while the sum is 71.

The spelling of 84408588894221 in words is "eighty-four trillion, four hundred eight billion, five hundred eighty-eight million, eight hundred ninety-four thousand, two hundred twenty-one".