21828803 has 2 divisors, whose sum is σ = 21828804. Its totient is φ = 21828802.

The previous prime is 21828791. The next prime is 21828823. The reversal of 21828803 is 30882812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21828803 - 2¹⁴ = 21812419 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21828803.

It is not a weakly prime, because it can be changed into another prime (21828823) 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 as a sum of consecutive naturals, namely, 10914401 + 10914402.

It is an arithmetic number, because the mean of its divisors is an integer number (10914402).

Almost surely, 2^21828803 is an apocalyptic number.

21828803 is a deficient number, since it is larger than the sum of its proper divisors (1).

21828803 is an equidigital number, since it uses as much as digits as its factorization.

21828803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 21828803 is about 4672.1304562266. The cubic root of 21828803 is about 279.4752202967.

The spelling of 21828803 in words is "twenty-one million, eight hundred twenty-eight thousand, eight hundred three".