21016763 has 2 divisors, whose sum is σ = 21016764. Its totient is φ = 21016762.

The previous prime is 21016753. The next prime is 21016799. The reversal of 21016763 is 36761012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21016763 - 2⁴ = 21016747 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (21016753) 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, 10508381 + 10508382.

It is an arithmetic number, because the mean of its divisors is an integer number (10508382).

Almost surely, 2^21016763 is an apocalyptic number.

21016763 is a deficient number, since it is larger than the sum of its proper divisors (1).

21016763 is an equidigital number, since it uses as much as digits as its factorization.

21016763 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 21016763 is about 4584.4043233554. The cubic root of 21016763 is about 275.9658073934.

Adding to 21016763 its reverse (36761012), we get a palindrome (57777775).

The spelling of 21016763 in words is "twenty-one million, sixteen thousand, seven hundred sixty-three".