84717408821 has 2 divisors, whose sum is σ = 84717408822. Its totient is φ = 84717408820.

The previous prime is 84717408803. The next prime is 84717408877. The reversal of 84717408821 is 12880471748.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81347025796 + 3370383025 = 285214^2 + 58055^2 .

It is a cyclic number.

It is not a de Polignac number, because 84717408821 - 2¹⁴ = 84717392437 is a prime.

It is a super-2 number, since 2×84717408821² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 84717408821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84717408421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42358704410 + 42358704411.

It is an arithmetic number, because the mean of its divisors is an integer number (42358704411).

Almost surely, 2^84717408821 is an apocalyptic number.

It is an amenable number.

84717408821 is a deficient number, since it is larger than the sum of its proper divisors (1).

84717408821 is an equidigital number, since it uses as much as digits as its factorization.

84717408821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 802816, while the sum is 50.

The spelling of 84717408821 in words is "eighty-four billion, seven hundred seventeen million, four hundred eight thousand, eight hundred twenty-one".