98840021 has 4 divisors (see below), whose sum is σ = 112960032. Its totient is φ = 84720012.

The previous prime is 98840009. The next prime is 98840051. The reversal of 98840021 is 12004889.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12004889 = 13 ⋅923453.

It is a cyclic number.

It is not a de Polignac number, because 98840021 - 2¹⁸ = 98577877 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 98840021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (98840051) 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, 7059995 + ... + 7060008.

It is an arithmetic number, because the mean of its divisors is an integer number (28240008).

Almost surely, 2^98840021 is an apocalyptic number.

It is an amenable number.

98840021 is a deficient number, since it is larger than the sum of its proper divisors (14120011).

98840021 is a wasteful number, since it uses less digits than its factorization.

98840021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14120010.

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 98840021 is about 9941.8318734527. The cubic root of 98840021 is about 462.3571836615.

The spelling of 98840021 in words is "ninety-eight million, eight hundred forty thousand, twenty-one".