21016299 has 16 divisors (see below), whose sum is σ = 29617280. Its totient is φ = 13219200.

The previous prime is 21016297. The next prime is 21016309. The reversal of 21016299 is 99261012.

It is a happy number.

It is not a de Polignac number, because 21016299 - 2¹ = 21016297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21016297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16899 + ... + 18099.

It is an arithmetic number, because the mean of its divisors is an integer number (1851080).

Almost surely, 2^21016299 is an apocalyptic number.

21016299 is a deficient number, since it is larger than the sum of its proper divisors (8600981).

21016299 is a wasteful number, since it uses less digits than its factorization.

21016299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1530.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 21016299 is about 4584.3537167195. The cubic root of 21016299 is about 275.9637764895.

The spelling of 21016299 in words is "twenty-one million, sixteen thousand, two hundred ninety-nine".