98721 has 12 divisors (see below), whose sum is σ = 163072. Its totient is φ = 56376.

The previous prime is 98717. The next prime is 98729. The reversal of 98721 is 12789.

It is not a de Polignac number, because 98721 - 2² = 98717 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (98729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 721 + ... + 846.

2⁹⁸⁷²¹ is an apocalyptic number.

It is an amenable number.

98721 is a deficient number, since it is larger than the sum of its proper divisors (64351).

98721 is a wasteful number, since it uses less digits than its factorization.

98721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580 (or 1577 counting only the distinct ones).

The product of its digits is 1008, while the sum is 27.

The square root of 98721 is about 314.1989815388. The cubic root of 98721 is about 46.2171522302.

The spelling of 98721 in words is "ninety-eight thousand, seven hundred twenty-one".