98821 has 4 divisors (see below), whose sum is σ = 104652. Its totient is φ = 92992.

The previous prime is 98809. The next prime is 98837. The reversal of 98821 is 12889.

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 72900 + 25921 = 270^2 + 161^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-98821 is a prime.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 98821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (98801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2890 + ... + 2923.

It is an arithmetic number, because the mean of its divisors is an integer number (26163).

2⁹⁸⁸²¹ is an apocalyptic number.

It is an amenable number.

98821 is a deficient number, since it is larger than the sum of its proper divisors (5831).

98821 is a wasteful number, since it uses less digits than its factorization.

98821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5830.

The product of its digits is 1152, while the sum is 28.

The square root of 98821 is about 314.3580760852. The cubic root of 98821 is about 46.2327522734.

It can be divided in two parts, 98 and 821, that added together give a palindrome (919).

The spelling of 98821 in words is "ninety-eight thousand, eight hundred twenty-one".