98021819891 has 4 divisors (see below), whose sum is σ = 98032755384. Its totient is φ = 98010884400.

The previous prime is 98021819873. The next prime is 98021819893. The reversal of 98021819891 is 19891812089.

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 98021819891 - 2⁶ = 98021819827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (98021819893) 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, 5454290 + ... + 5472231.

It is an arithmetic number, because the mean of its divisors is an integer number (24508188846).

Almost surely, 2^98021819891 is an apocalyptic number.

98021819891 is a deficient number, since it is larger than the sum of its proper divisors (10935493).

98021819891 is a wasteful number, since it uses less digits than its factorization.

98021819891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10935492.

The product of its (nonzero) digits is 746496, while the sum is 56.

The spelling of 98021819891 in words is "ninety-eight billion, twenty-one million, eight hundred nineteen thousand, eight hundred ninety-one".