84821894867 has 4 divisors (see below), whose sum is σ = 87558085056. Its totient is φ = 82085704680.

The previous prime is 84821894863. The next prime is 84821894869. The reversal of 84821894867 is 76849812848.

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

It is a cyclic number.

It is not a de Polignac number, because 84821894867 - 2² = 84821894863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84821894863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1368095048 + ... + 1368095109.

It is an arithmetic number, because the mean of its divisors is an integer number (21889521264).

Almost surely, 2^84821894867 is an apocalyptic number.

84821894867 is a deficient number, since it is larger than the sum of its proper divisors (2736190189).

84821894867 is a wasteful number, since it uses less digits than its factorization.

84821894867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2736190188.

The product of its digits is 49545216, while the sum is 65.

The spelling of 84821894867 in words is "eighty-four billion, eight hundred twenty-one million, eight hundred ninety-four thousand, eight hundred sixty-seven".