21770803 has 2 divisors, whose sum is σ = 21770804. Its totient is φ = 21770802.

The previous prime is 21770797. The next prime is 21770831. The reversal of 21770803 is 30807712.

It is a happy number.

It is an a-pointer prime, because the next prime (21770831) can be obtained adding 21770803 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21770803 - 2¹⁷ = 21639731 is a prime.

It is not a weakly prime, because it can be changed into another prime (21770843) 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, 10885401 + 10885402.

It is an arithmetic number, because the mean of its divisors is an integer number (10885402).

Almost surely, 2^21770803 is an apocalyptic number.

21770803 is a deficient number, since it is larger than the sum of its proper divisors (1).

21770803 is an equidigital number, since it uses as much as digits as its factorization.

21770803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2352, while the sum is 28.

The square root of 21770803 is about 4665.9193092037. The cubic root of 21770803 is about 279.2274751426.

The spelling of 21770803 in words is "twenty-one million, seven hundred seventy thousand, eight hundred three".