21446799 has 16 divisors (see below), whose sum is σ = 31363200. Its totient is φ = 12928160.

The previous prime is 21446783. The next prime is 21446819. The reversal of 21446799 is 99764412.

It is a cyclic number.

It is not a de Polignac number, because 21446799 - 2⁴ = 21446783 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21446799.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21446729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4852 + ... + 8150.

It is an arithmetic number, because the mean of its divisors is an integer number (1960200).

Almost surely, 2^21446799 is an apocalyptic number.

21446799 is a deficient number, since it is larger than the sum of its proper divisors (9916401).

21446799 is a wasteful number, since it uses less digits than its factorization.

21446799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3510.

The product of its digits is 108864, while the sum is 42.

The square root of 21446799 is about 4631.0688830982. The cubic root of 21446799 is about 277.8353449340.

The spelling of 21446799 in words is "twenty-one million, four hundred forty-six thousand, seven hundred ninety-nine".