21038363 has 2 divisors, whose sum is σ = 21038364. Its totient is φ = 21038362.

The previous prime is 21038341. The next prime is 21038389. The reversal of 21038363 is 36383012.

It is an a-pointer prime, because the next prime (21038389) can be obtained adding 21038363 to its sum of digits (26).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21038363 - 2¹⁰ = 21037339 is a prime.

It is a super-2 number, since 2×21038363² = 885225435439538, which contains 22 as substring.

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 (21038323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10519181 + 10519182.

It is an arithmetic number, because the mean of its divisors is an integer number (10519182).

Almost surely, 2^21038363 is an apocalyptic number.

21038363 is a deficient number, since it is larger than the sum of its proper divisors (1).

21038363 is an equidigital number, since it uses as much as digits as its factorization.

21038363 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 21038363 is about 4586.7595315211. The cubic root of 21038363 is about 276.0603164053.

The spelling of 21038363 in words is "twenty-one million, thirty-eight thousand, three hundred sixty-three".