84821894797 has 4 divisors (see below), whose sum is σ = 85092891580. Its totient is φ = 84550898016.

The previous prime is 84821894771. The next prime is 84821894821. The reversal of 84821894797 is 79749812848.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21461957001 + 63359937796 = 146499^2 + 251714^2 .

It is a cyclic number.

It is not a de Polignac number, because 84821894797 - 2⁷ = 84821894669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84821894497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135497922 + ... + 135498547.

It is an arithmetic number, because the mean of its divisors is an integer number (21273222895).

Almost surely, 2^84821894797 is an apocalyptic number.

It is an amenable number.

84821894797 is a deficient number, since it is larger than the sum of its proper divisors (270996783).

84821894797 is a wasteful number, since it uses less digits than its factorization.

84821894797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 270996782.

The product of its digits is 65028096, while the sum is 67.

The spelling of 84821894797 in words is "eighty-four billion, eight hundred twenty-one million, eight hundred ninety-four thousand, seven hundred ninety-seven".