21098299 has 4 divisors (see below), whose sum is σ = 21115864. Its totient is φ = 21080736.

The previous prime is 21098269. The next prime is 21098327. The reversal of 21098299 is 99289012.

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 21098299 - 2⁷ = 21098171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21098269) 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, 6837 + ... + 9430.

It is an arithmetic number, because the mean of its divisors is an integer number (5278966).

Almost surely, 2^21098299 is an apocalyptic number.

21098299 is a deficient number, since it is larger than the sum of its proper divisors (17565).

21098299 is a wasteful number, since it uses less digits than its factorization.

21098299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17564.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 21098299 is about 4593.2884734142. The cubic root of 21098299 is about 276.3222230851.

The spelling of 21098299 in words is "twenty-one million, ninety-eight thousand, two hundred ninety-nine".