21916811 has 8 divisors (see below), whose sum is σ = 25094400. Its totient is φ = 18750888.

The previous prime is 21916793. The next prime is 21916847. The reversal of 21916811 is 11861912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21916811 - 2¹⁴ = 21900427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21916871) 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 7 ways as a sum of consecutive naturals, for example, 1580 + ... + 6806.

It is an arithmetic number, because the mean of its divisors is an integer number (3136800).

Almost surely, 2^21916811 is an apocalyptic number.

21916811 is a deficient number, since it is larger than the sum of its proper divisors (3177589).

21916811 is an equidigital number, since it uses as much as digits as its factorization.

21916811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5833.

The product of its digits is 864, while the sum is 29.

The square root of 21916811 is about 4681.5393835789. The cubic root of 21916811 is about 279.8503068904.

The spelling of 21916811 in words is "twenty-one million, nine hundred sixteen thousand, eight hundred eleven".